Description: Material: Bicycle training wheels are made of PVC and steel which it is anti-slip, wear resistant, good stability. Flash mute bike training wheels allow children to enjoy the fun of cycling. Safety: bike wheels and steel material, which will be safer and more stable for beginners. This set of stabilizers assist young learners until they have developed a usable sense of balance on the bicycle, which can improve your child's safety and confidence. Installation: We offer complete installation tools, (1 x screws, 2 x screws, 1x magnetic core) so it's easy for you to install the training wheel on your bike quickly. Note: Bicycle training wheels fit for Single Speed Bikes Only (Cannot Be Installed On Bikes with Derailleurs) and Supports Riders up to 100 Pounds .The wheels diameter is 4.33 inch. Universal bicycle wheels are suitable for 16/ 18inch children's bicycles. Light: When riding, the wheels will glow, which is more obvious and safer when riding at night or in any dark environment. Specification: Product name: Bicycle training wheel Color: black, blue, pink Material: PVC, steel Size(approx.): support rod length 16inch/41cm, 18inch/46cm Package Includes: 2pcs*Bicycle training wheel 2pcs*Support Rod 1pc*screw nail 2pc*screw 1pc*magnetic core Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.