A fully replaceable 11mm thick Nylon-Fibreglass guard that is  bolted securely into our Felix Guard Sprockets via x5 bolts. Materialinjection molded nylon/fibreglass replaceable guard Size25t Thickness11mm thick guard Colorsblack Features• 25t • super durable, replaceable Felix nylon/fiberglass guard• fits  Felix Guard Sprocket.• x5 bolts included