So I put a set of Innovation on my bass at the end of summer 2017. I bought them on a whim, though I did some research first. Before I was using most Dominants, Flexocor (92's), Flexocor Originals, Spirocores, in various configurations. I have tried almost every string out people put a bow on, including most all of the varieties from D'Addario, Thomastik, Pirastro, Velvet, Jargar brands. My bass is 3/4 flatback 100+ yr old Italian which runs pretty tight, so even light strings often end up tight-feeling. . It's not big, so I'm always trying to find a string that is big sounding and soft feeling. I am very pleased with these Polychrome strings on my bass. I play 100% arco gigs and 100% pizz gigs with the same bass. I own only one- so I have to have a versatile setup. It’s a relatively small bass, so I’m often challenged to get a big sound or a lot of volume. So basically what I believe a hybrid string should be is one that responds very well to the bow, amplifies well, is bright enough for jazz with a respectable amount of sustain. Even better if the strings are soft feeling under both hands. Innovations Polychrome Strings Review: These are touted to be hybrid strings, and they are. These just might fly off the shelves inasmuch as bass strings can. Be aware that these do sound more old-school than steel strings. They sound less metallic and less dense- more spread and thump. I bought a set of Polychromes to try out from Gollihur Music. These strings are new to the market, and billed as a hybrid string. They are in thickness a little bit thinner than Spiro Med/Mittel/Orch in the lower strings, and fatter than most strings on the G string. They are a bit stiffer than Spiros out of the package (less stiff than dominants), but feel softer and more flexible than Spirocores when strung on the bass. Day 1 First impressions: · These bow beautifully. I am shocked. And thrilled. · They are fat feeling but soft, and get a big dense tone. · They are even comfortable up in thumb position. · Less sustain and growl than Spiros, but respectable in both aspects. · Not very bright, but articulate pizzicato, with a top end similar to obligatos (without the roll) · They are not as loud as Dominants, but get a big full sound and plenty loud. 6+ months: Still the best set I’ve tried on this bass. · The strings never slipped out of tune. After the first day and only a little stretching, these strings held the pitch. That’s unusual. · They have darkened a bit. The brilliance on top is not as noticeable now, but there is still clarity in the pizz articulation. · They bow very well, and have remained in balance as they’ve settled. In fact, I don’t think I’ve used a set of strings that have responded better to the bow for me on this instrument. · These strings get a big fat woody sound that I absolutely love. And they are thumpy too. They also growl and amplify very well- I do have to turn the bass down. · Dynamic. Comfy. Powerful. And I can play 400 beats per minute more comfortably on these strings than any I've used before. Let’s compare them to my experience with 3 popular strings: Flexocor (92), Spirocore, and Pirazzi strings. Flexocors bow very well, but are brutal on my right hand for jazz. They also lack clarity in pizz articulation. These Polychromes bow every bit as well, but offer a sound I prefer, and are easier on my right hand. They also have more pizz clarity. I’m comfortable playing both strings in the upper register. Polychromes give more volume and a bigger sound on this bass. They are no less comfortable to play with a bow. Spircores are resistant to bowing on this bass. The bow doesn’t always bite. They are bright and sometimes too metallic under the bow. The Polychromes bow much more easily on my bass, and offer a more woody tone. There is some brightness, but it’s not like Thomastik strings, which all have a metallic sound quality to my ears. The brightness is on top of the tone, rather than an integral part of the tone. Pirazzi strings have a great thump with some clarity. They bow OK, but the bowed response is slow. I also find I have to beat on them to get any sound out of my bass when I use them. So for me, they don’t bow well. It’s my opinion that these Polychromes are what the Pirazzi bass strings want to be when they grow up. I have found that the Pirazzi Long E is a good choice under these for basses with C extension. The Pirazzi C string feels tighter and brighter under these strings than it does under 3 Pirazzi's. To summarize: These new Polychromes are the best I've tried on my bass. They bow very well on my bass- as well as anything I’ve ever used. They get a big woody sound out of my bass with enough clarity and growl to use as a jazz/amplified string (not for magnetic pickups). They are easy to play up high, as well- easy on the left hand. The Polychromes are bright on top, but not metallic. They offer a nice clarity of articulation while presenting a very woody tone with a lot of thump. They are also easy on the both hands pizz and arco. I suspect these strings will feel rather soft, even too soft/light, on some instruments. My bass runs tight, and I am very happy with the softer feel these offer. I’ll bet these will work very well on new basses. I can play these comfortably with the soundpost up near the bridge. With the previous steel core strings setup, I had the post as far south as I could in order to bow the bass comfortably. I hope this helps somebody. I recommend these strings to professional orchestra players as well as full time Jazz or Bluegrass/ Acoustic musicians. They bow that well and sound that good to me.