Standard taper size reusable Teflon joint sleeves. Unique manufacturing process permits superior quality Teflon® joint sleeves at unbelievably low prices. Price permits disposability! Elongated cones of micro-thin virgin PTFE film tapered to fit snugly around glass joints. Approximately 0.05 mm (0.002") thick with taper of approximately 1.10 on diameter. Eliminates the need for lubrication and frozen, leaky ground joints. Can be used over a temperature range of -75° to +260° C. Additional sizes available upon request.