Full Disclosure: I now play a fully carved bass with 3885 Spirocore Weichs and a plywood Strunal with a full set of Evah Slap Synthetics. The Evah’s are great for slap, pizz and arco practice as well as outdoor work (bluegrass, old time, and/or cover band). They are not as easy to hear as the Spiros for intonation practice but the Evah Slaps are a great set.