Dynalon 362635 PTFE Reusable Joint Sleeve, 24/40 Taper (Case of 6) Dimensions (L x W x H): 1.625 x 1.25 x 0 inch 24/40 standard taper size reusable PTFE joint sleeve Price permits disposability; elongated cones of micro-thin virgin PTFE film tapered to fit snugly around glass joints Approximately 0.05 mm (0.002 inch) thick with taper of approximately 1.10 on diameter Eliminates need for lubrication and frozen, leaky ground joints; can be used over a temperature range of -75 to +260 C