• Ideal for science and engineering projects, these wheels are designed to make your rubber band-powered vehicles and mousetrap cars perform the way you expect.
• The wheel axle hole has 4 teeth to grip the included 6 x 1/4" dowels, preventing slippage. Rubber bands add traction to the outer wheel. Extra dowels and rubber bands included.
• Easy to work with! If you have built a car project with CDs for wheels, you know what a hassle that is. These wheels fit snugly onto sturdy wooden dowels.
• Wheels measure 4.75 inches in diameter and ¼ inches wide tread, axle hole inner diameter is ¼ inch, the dowels are ¼ by 6 inches, the rubber bands are 1/8 by 3.5 inches.
• Made of sturdy, safe, reusable, and recyclable polypropylene plastic.