1.Different Sizes:1/2'' IDx6'',3/8'' IDx6'',1'' IDx6'',Custom size available 2.radiant heat, direct cotact 3.High terperature 1.Different Sizes:1/2'' IDx6'',3/8'' IDx6'',1'' IDx6'',Custom size available2.radiant heat, direct cotact3.High terperature4.Small order QTY is accepted Varies Sizes high terperature Fiberglass Sleeve