Strong, lightweight bellows are heat sealed to keep out moisture and contaminants. There are no stitches or glue that could fail. Color is black. They have high resistance to ozone, chemicals, gasoline, kerosene and most other aliphatic petroleum products, plus excellent resistance to ultraviolet and gamma rays. The bellows have high abrasion resistance and tensile strength. Temperature range is -60 to +225 F. Round thickness is .010". Round bellows have 1/2" cuffs that may be secured with standard hose clamps. Available in 12" and 24" extended lengths that compress to 1" and 2" respectively. Square/rectangular thickness is .020". Square bellows have square ends without cuffs and are available in 12" and 24" extended length that compresses to 1- 1/2" and 3" respectively.