Players glide the "stones" toward the target, and the one closest to the bull's-eye scores a point. Develops hand/eye coordination and teaches game fundamentals. Each rugged-plastic stone features a sturdy handle and 3 heavy-duty ball-bearing rollers. Set includes 8 stones (7" dia x 3-1/2"H / 18 cm x 9 cm), a vinyl target, and storage bag. 66 lb (30 kg) total.