AXP Chain Guide (Red) Gas Gas MC250F-MC450F EX250F-EX450F EC250F-EC350F EX300 EC250-EC300 21-22 Machined in thick Ultra-high-molecular-weight (UHMW) plastic sheets, AXP Chain Guides are stronger than the OEM parts, offering a better durability and resistance to impacts! Tested and approved by pro riders! Chain Guides are available for a wide variety of bikes.