Made from the ever popular Duracon synthetic material, which is commonly used in performance products. This material is popular because of its high strength and durability to heat. So we decided to use this as it not only suits the looks for your car but it also feels most comfortable for the driver's hand. Tomei Duracon Shift Knob for compatible M10 x 1.25mm shifters. Made of Duracon, a material of Polyoxymethylene composities that is known for their high degree of crystallinity, and in turn offers high strength, stiffness and hardness, good chemical and environmental resistance including heat and moisture absorption. The shift knob is about no more than 5 ounces, so it is very lightweight and high strength.