Cello Slide-proof Rug Pad - TOOGOO(R) Violoncello Cello Slide-proof Rug Pad Stop End Pin Stand Holder Black Classic,glossy,dark walnut-effect end pin holder. This item is a practical cello end pin holder, which is made from solid plastic and has a non-slip rubber foam base which is equally effective on any type of flooring from wood to carpet. To protect your floor from scratches and make sure your cello doesn't slip during a practice or performance.