60% Vespel / 40% Graphite ferrules have an upper temperature limit of 400 deg. C .Ferrule is for standard 1/4 in. Swagelok / Parker type fittings. 1/16 in. ID fits over 1/16 in. OD tubing. One piece design requires no back ferrule. Packaged: 2-3/8 in. x 1-1/4 in. x 1/2 in. Plasitc Box; Weight: 11.3 g.