P.G. Sofs are roto-molded from foam-vinyl and combine the best features of traditional rubber balls and coated foam balls. Sofs are supple, squeezable, "sting-free" and bounce like a rubber ball! Plus, the tips will easily compress on impact to reduce the "fear factor" when learning to catch footballs. Sof's don't have internal bladders, so their designated diameter can be varied by an inch or two to find the desired softness and bounce. Set of six colors (1 each of red, yellow, blue, green, orange and purple).