The Crosstrail/Ariel Master Packaging Fender Set includes five fender sets that fit on our Crosstrail and Ariel bikes. And with pre-adjustments, the fenders can be assembled fast and easily on either of these bikes. The fender sets are constructed from strong, lightweight aluminum, and they're intended for use with our Plug + Play and standard eyelet mounting system. Lastly, they can accommodate up to 38mm tires, and they have long-wearing, stainless steel stays and hardware.