Dominants are a great string. Slightly more aggressive.I'm predominantly an arco player. I've used spiro S42 meds and weichs over the years with good bowing results. The thing that bugs me about spiros is the unevenness of tone and volume response across string -- on my bass. I recently put Dominants on my bass. They are consistent arco cross-string, and sound nice and noble, but are a bit scratchier than spiros. They are beautiful pizz.