They have no sharp edges and are amazingly flexible. Chromoplastics have a worldwide reference for mudguards of the highest quality and are fitted to top of the range bicycles by specialized quality manufacturers in many countries. To retrofit with Chromoplastic mudguards immediately upgrades any racing, trekking, city, or mountain bike. All accessories are made of stainless steel: Stays with a diametre of 3.4mm as well as bolts and nuts. The decor stripes give the Chromoplastic an unmistakeable appearance. For safety reasons the front stays are mounted with Secu Clips. Please Note: These mudguards are designed to fit with 700c wheels but the metal stays may require cutting with a hacksaw or heavy duty wire cutters during fitting.