Product description the difference is total performance more short game spin and control with softer feel high launch and low spin for extraordinary distance and long lasting durability dimple design the pro v1x features a spherically tiled 328 tetrahedral dimple design core the pro v1x is a four piece multi component technology with a zg process dual core and ionomeric casing layer cover system patented softer urethane elastomer cover your long game the difference is exceptional distance