All ARC Brake Levers famously fold forward when you go down (and every off-roader does!) so they don't bend or break in a fall. ARC Aluminum Folding Levers: This is the original folding lever. Adjustable for hand size and move to prevent damage in a crash. ARC's aluminum levers are forged for durability and then CNC machined for accuracy. The "knee" is made from billet aluminum. All of the hardware is top grade. These are the same levers that many of the top pro's run. Lifetime warranty. ARC Composite Folding Levers: Aircraft and race cars have used composite materials for years and now ARC has incorporated this technology into their levers. The ARC composite levers have the same functioning features as the ARC aluminum levers.