It is a precision molded “transitional tool “which offers the ultimate solution for sore fingers experienced when learning to play guitar, (also great for those who may play infrequently)
You can play or practice longer while your fingers continue to toughen.
A great “transitional tool” for beginners which still allows for “GRADUAL” Callus development!
Works equally well for other stringed instruments, banjo, mandolin, ukulele.