Weighted stainless steel for smooth shifts; approx 500g. Designed to fit all 6-Speed Honda Civic Si and Type R. Shift Knob fuctions with 10x1.5mm factory shifter and boot retainers. Machined with precision, powder-coated, and laser engraved shift pattern in Lancaster PA USA. Ergonomically designed for ease of install (NO Modification Required), comfort, and enhanced shifting. Billetworkz Weighted Stainless Steel Gear Shift Knob for Honda Civic Si and Type R. It is designed to precisely work with the factory shifter and boot retainers. Machined with precision and powdercoated in Lancaster PA USA. 10x1.5mm threads for proper fitment.