Lotus Tubeless Tire Seals are an excellent repair method for tubeless tyres. They are made of fresh butyl rubber. They are very strong made up of 12 strands. Specifications: Products Code Discription Specifications Color Box Quantity 1051 Tubeless Tire String Inserts Strands 12, Length 4" (100mm), Diameter 6mm Brown/Black 25 1052 Tubeless Tire String Inserts Strands 12, Length 8" (200mm), Diameter