Convertible Double First Base Youth League Set includes: (1) 14" Double first base non-release type base, (2) 14" progressive release bases, (3) Convertible tees which fit easily into each base, (1) 12" spike to secure double first base, (1) Spike-down disk. Youth size, 14" double first base, both the fielder and runner have a space at the base, preventing collisions. Second and third base, the 14" Soft Touch Progressive Release Bases are designed to "pop" off and release from their mount when enough force is applied, preventing injuries. Youth Bases are made from durable polyurethane. Progressive Release bases flex until overcome with force and release from the base mount. Double first base anchors with a disk and spike mounting system.