Protect-A-Boots solve the problem of burning and cracking plug boots and wires from header and engine heat. Features Made from a high temperature, nonflammable glass fiber material able to withstand temperatures up to 1000F. Boots are of double-wall construction. Advantages Boots & Sleeving provide protection against harmful, high under-hood temperatures. Shrink tubes are included to provide a water-tight seal. Benefits Protecting spark plug boots & wires helps prevent burn-through, hardening & cracking of boots. Boot Protectors are universal, fitting most straight or angled spark plug boots. Boot Protectors and Sleeving provide a professional finished look. Boots are 6 in. in length with a sewn in ring, and fit wire size up to 8mm. 4 Cylinder Kit Contains: 13 ft of line sleeving 12 - Hi-Temp Shrink Tubes 4 - Protect-A-Boots