The Quad Classic-PRO has the same great shape and fit as our popular Quad Classic (Perfect Oval/Power Regular combo) but in NEW 55 durometer hardness. The stiffer flex and firm texture of the Classic-PRO make it great insert option for competitive bowlers who have a tough time using softer-textured inserts.
Durometer Updated 55 Shore A
Sizes Available: 19/32 -29/32, Standard Diameter 31/32”
Colors: Black and Blue ONLY