GRID foam ball combines the benefits of a massage ball and foam roller into compact and targeted muscle pain relief Lightweight, portable, and durable EVA Foam massage ball is an ideal travel companion on the road GRID pattern promotes increased blood and oxygen flow to muscles for quick muscle recovery 5-inch diameter targets tightness in hard-to-reach places such as shoulders, traps, and hips to relieve muscle pain and improve mobility Dimensions: 5 inches x 5.7 inches x 6.4 inches (approx.) Weight limit: 325lbs