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This is probably the best type of device for keeping your cello from sliding forward. After repeated use, be sure to wash it well so that you remove dust and possible oils from the rubber. After a few years it will dry out and is likely to not work as well. At that point it's time for replacement.
I bought this for my 8-year old. She just started her cello lesson and still trying to find the comfortable posture. This disc is easy to move around comparing with the one attached to the seat. It is thick enough to protect our floor.