Aluminium alloy made wheel riser, durable and lightweight. Fits most sizes of bikes, fits all road and mountain bikes,. Pads on the bottom protect your floor form damage during training. Rise the front wheel and keep bike steady and straight for better cycle training. FUNCTION --- This bike riser block keeps your bicycle's front tire in place and raises the front just enough that you will not be sliding off your seat while pedaling, keep bike steady and straight for better cycle training. Anti-slipping design, keeps you secure.PRODUCT DESCRIPTION If you do your biking training with your bike being slightly unparalleled to the ground, it would cause hand fatigue. This item is designed for better indoor cycling training, it rises the front wheel to keep bike parallel to the floor and straight for stable and safe cycling. Made of aluminium alloy, it's durable and lightweight, with pads on the bottom, the wheel riser can protect you form slipping and your floor from damage at the same time. The groove fits most sizes of bikes, road bikes, mountain bikes. This is ideal for indoor bicycle training. Specification: Material: Aluminium Alloy Color: Black Size: 22.8¡Á 11.8 ¡Á 5.7cm / 8.97in ¡Á 4.46in ¡Á 2.24in Weight: approx 165g Package Included: 1 ¡Á Wheel Riser Block Only