Agility Gear 1" Molded Jump Cups - 10 Pack This is a package of 10 Molded Jump Cups. Included with the Cups are Agility Gear Do It / Make It Yourself Jump Instructions. They clip onto 1" Internal Diameter ( or approx 1.3" External Diameter ) PVC in seconds The Cups are molded without sharp edges for safety and meet all AKC Specifications They allow the jump bar to be set at multiple heights by sliding the cups up or down the uprights