1 pair 12 Inch 20 Inch Kids Training Wheels Universal Children Safety Support Wheels Cycling Stabilisers Rear wheel stabilizer: Our products are treated with static electricity without scrubbing, and can keep bright and beautiful for a long time. This heavy-duty rear wheel stabilizer helps young students ride bicycles until they have a sense of balance available. Safety and stability: These heavy rear wheels provide the necessary safety and stability for the first road test of the bicycle, so that your child can get the best start of balance and confidence without holding the saddle. Applicable type: Suitable for most 12-inch to 20-inch single-speed bicycles. In addition to HUFFY bicycles and variable speed bicycles, the support wheels are suitable for most 12-20 inch single speed bicycles with horizontal rearward track fork ends Specification: Color: black/ blue/ pink/ red Material: metal How do I install bicycle stabilisers?  Step 1: Connect the jockey wheel and the support rod together. First mount the screw, wheel, seal, bracket arm and nut, then attach with a wrench.  Step 2: Release the rear axle nut of the bike, attach the stop block and attach the pointed horn of the stop block to the bicycle frame.  Step 3: Choose the correct hole position on the rail depending on the size of the bike or wheel. Attach with the nut by gently pressing on it.  Step 4: Install the jockey wheel in the same way on the other side. To install it smoothly, please screw in the pressure.