Welcome to our store！</br> 1、Secondary Wheel Material: The main body of the secondary wheel is made of PU material, which has high wear resistance and will not be excessively worn after a long time of driving. 2、Product Description: The principle of the luminous wheel is that the built in micro generator can turn up to generate electricity and the lamp will light up (no battery). 3、Anti Slip: Our training wheels for kids bike is made to be slip proof for a safer, easier ride. Your child has a smoother ride and you can rest easy as they learn to ride a bicycle. 4、Support Process: The support adopts multi layer paint baking process, with smooth surface and no burr, and is not easy to hurt hands during installation. 5、Easy to Install: Our bike training wheels can be installed onto your children bike quickly and simply. Just install and your child is ready to ride! <p class="wang-edit-text"><p class="wang-edit-text"> Item Type:&nbsp;Kids&nbsp;Bike&nbsp;Auxiliary&nbsp;Wheel Product Material: PU, Carbon Steel Product Color: Black Weight: Approx. 690g / 24.3oz Wheel Diameter: Approx. 11cm / 4.3in <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 2 x Shoulder Bolt 2 x Training Wheel 2 x Vertical Support 2 x Washer 2 x Lock Nut 2 x Limit gasket 1 x Wrench Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>