Thih string- type insert black color, length 204 mm, width 3mm.String-Type inserts can be used in passenger or truck, radial or bias-ply tires. Made of a butyl rubber, these inserts are very strong, allowing easy insertion through steel belted radiāls. String-Type inserts are TEMPORARY repairs, sealing by compression only.To install thin string use any closed eye needle.To install all other string- typeinserts use any end-slot needle. Realization box only= 50pcs