Agility Gear 3/4" Molded Jump Cups - 10 Pack This is a package of 10 Molded Jump Cups specifically engineered for your dog's safety in accordance with AKC specifications. Included with the Cups are Agility Gear Do It / Make It Yourself Jump Instructions. They clip onto 3/4" Internal Diameter ( or approx 1.0" External Diameter ) PVC in seconds The Cups allow the jump bar to be set at multiple heights by sliding the cups up or down the Uprights Safety Features: ( 1 ) The cups are molded without sharp edges, ( 2 ) They allow the jump bar to be easily displaced. These features are incorporated into the cup's design to help prevent injury to your dog.