100% Vespel polyimide. Upper temperature limit 350 deg. C. 1/16 in. ID fits 1/16 in. OD tubing; ferrule fits into 1/4 in. Swagelok / Parker type fittings. One piece design requires no back ferrule. Packaged: 2-3/8 in. x 1-1/4 in. x 1/2 in. Plastic Hinged Box; Weight: 11.3 g.