These LIFTATAPA training wheels are perfect for helping kids learn to ride bicycles confidently! Designed specifically for 12, 14, 16, 18, and 20 inch single-speed kids' bikes (not compatible with derailleur bikes). The wheels feature a flash mute design that provides a silent riding experience without distracting noise. Made from quality PVC and steel materials, these training wheels are slip-resistant and wear-resistant for stable performance. The high-quality steel ball bearings ensure a smooth, efficient ride with minimal friction. The kit includes everything needed for easy installation: 1 pair of training wheels, 2 shoulder bolts, 2 nuts, 2 washers, 2 stop spacers, and 2 vertical bracket arms. The adjustable design allows you to set the appropriate height for your child's bike and gradually raise the wheels as their balance improves. These stabilizers help young riders develop balance and coordination without needing someone to hold the saddle, building their confidence safely. The 4.33 inch diameter wheels provide stable support, and the black color blends well with most bike designs. Remember to always supervise children while they're using training wheels. Whether your child is just starting their cycling journey or needs extra stability while building confidence, these training wheels provide the reliable support that makes learning to ride a positive, enjoyable experience for both kids and parents.