Winding Thread Rubber bladders,polyester wound bladders for soccer Type : Rubber Material: Rubber or Butyl bladder, 30%, 50% or 80% Butyl Size: Size 5 , Size 4 , Size 3 Features: Durable, Stops over inflation, Keeps better shape,Reduces its deformance. Packing : 50PCS/CTN Origin : China HS Code : 95066290 Production Capacity : 2000PCS/Day All the products enjoy popular sales in Europe and America market. Specialize in the wide range of bladders for inflatable sports balls in China.Our bladders are popular with durable,round and economic in the international markets.