Dycem Rubber Cello End Pin Mat Anchors Your Cello End Pin Securely The Dycem Cello mat is a natty rubber mat and is guaranteed to hold your cello spike on even the slippiest floors. It is made by Dycem, and has a reinforced centre. This mat really works, and is only about 3 inches diameter, so will fit easily in the accessory pocket of your cello. An absolute must, and it really works!