Set of 4 Triniti balls, First high performance ball in fully recyclable packaging ,  core made with Engage Core technology: Plastomer that provides a new ball experience lasting 4 times longer than a regular ball , exterior made of STR felt, 50 Percent more flexible than normal felt for better anti, string contact and optimum durability ,  100 Percent recyclable packaging - contents: 1 x Wilson Triniti Ball Set, 4 Balls, 100 Percent Recyclable Packaging, WRT115200