Torque Solution Delrin Slim Shift KnobTorque Solution Delrin Slim Shift Knob Applications: Universal 12x1. 25 Torque Solution's Slim shift knob is made from an aerospace polymer Delrin material. Delrin material is impervious to heat and cold. Making it an excellent choice for racing applications and for daily driving in hot and cold climates. It is also not slippery and will not rattle like some metal knobs do. The hole extends as deep as possible to give you the lowest possible installed