L'MS Silica Gel Cello Anti-slip Endpin Anchor Spike End Pin Rest Holder Floor Protector (Purple) Made of High Quality Silica Gel,Durable Ultra Anti-slip and Environmentally Friendly Comes with Adjustable Strap, form 24" to 43" to accommodate most players Designed to Protect Your Floor From Scratches and Make Sure Your Cello Doesn't Slip During A Practice or Performance Great to Play the Cello Properly and Produce A Melodious Sound Soft and toughness Silica Gel Material Avoid Damage to Your Instrument