• plastic
• Construction: crafted with durable and waterproof materials to provide protection for your bike's flywheel and wind wheel
• Universal fit: designed to fit a wide range of bicycles, including mountain, road, and folding travel bikes
• Easy to carry: compact and lightweight, for taking along on outdoor adventures and travels
• Enhanced safety: protects your bike's flywheel and wind wheel from potential damage caused by external forces
• Modern design: sleek and stylish look that enhances the overall aesthetic of your bicycle