Bike Type:Kids Bike--Specifically designed for young children who are new to riding. Bike Frame Material:Steel- A strong and durable material that will last. Tire Type:Knobby- Feature small raised knobs that help the tires grip better in dirt and in mud. Model Number:22030. Ride like the wind on the Huffy So Sweet 12" kids' bicycle! It's designed with cool graphics, crossbar pads, stem pads and big knobby tires. Pre-assembled training wheels make it ideal for a beginner!