Peek (Polyetheretherketon) is a high temperature thermoplastic with excellent chemical resistance. Inert to all common solvents, it resists a wide range of inorganic liquids, and is widely used with semi-conductors. It has a working temperature of 249C (480F). The body of the tweezer is Stainless Steel, Antimagnetic. The tips are screw-on replaceable tips. Made in Switzerland