Top-selling double first base set. Approved for Little League and meets rule 1.06, which mandates a release style base. Dual safety design – top compresses on impact and base disengages upon slide-in. All rubber construction with a steel stanchion that fits 1½” female anchors. Vertically stable for game situations. Two dislodging strengths available: youth – 19 lbs of pressure varsity – 26 lbs of pressure. Official size 15” x 15” x 2½” – 3” (depending on model). Anchors sold separately. Individual bases available.