Fits on all the Cx4 models. Patented Design. 100% Made in the USA. The main body is made of 6061-T6 Aircraft grade aluminum. Precision CNC machined from billet. Weight: 8.2 ounces. Mil. Spec. acid etched (anti-glare). Anodized to give the unit a semi flat finish. Professionally laser engraved. These do not suppress sound in any way and are 100% legal for the regular civilian to own in all 50 US States.