Equine Jump Cups (sold in pairs) The simple to use Dapple Safety Jump Cups will eliminate the hassle of a lost pins. The Dapple cups are rubber coated and made of professional grade steel. The 3/8 diameter pin arm fits easily in to the standard 1/2 pin hole. So easy to use, you can change the cup with one hand. Made in USA. This style is made to have a shallow cup hold. Round rails and is for PVC Standards.