PEEK, stainless steel or PCTFE.

Double winged fittings with 10-32 thread, designed to be used with 1/16" OD tubing. They are rated to 6000 psi (414 bar).

F-142x ferrules are designed to be used with 1/16" OD tubing. They are rated to 6000 psi (414 bar). F-113 ferrules are designed to be used with 1/32" OD tubing. They are rated at 3500 - 6000 psi (241 - 414 bar).