This is a Mach One shoulder rest for viola. It has been used for about 5 years, so there are quite a few scratches and signs of use, but it doesn't affect its functionality. The feet are new ones that came with a new shoulder rest (with the Mach One logo, genuine product). The material is maple. The size is L, and as shown in photo 9, I personally used it on a 40.5 cm viola with the innermost hole. Depending on the size of your instrument, I think it can be used without any problems if it's 40.5 cm or larger. I'm selling it at a low price, so why not give it a try?