Circumference: 24.4 - 26.0 in./61.95 - 66.04 cm
Weight: 11.2 - 12.6 oz./317.51 - 357.2 g
Cover: Polyurethane/Cotton/Polyester
Bladder: Butyl
New competition DYNAMO has a 32 panel metallic design for greater visibility. This model is hand stitched for extra durability and features a four ply cotton backed PU composite cover. Official Size 4.