Wald 1216 Bicycle Training Wheels (12 to 16-Inch Wheels) Durable; includes everything you'll need to install the training wheels on a bike with 12-16" wheel All-steel construction and includes hardware, screws and nuts Easy to install Intended for use by riders weighing up to 75 pounds Wald training wheels are designed exclusively for single-speed bicycles, not designed for multi-speed bicycles