Similar in design and size to the discontinued 57878 train wheel by LEGO®, these wheels fit standard metal axles much more tightly - no gluing required! Perfect for use in ball bearing set-ups. These wheels also have a fully functional stud on their hub, perfect for decorated tiles or greeble work. Also compatible with the traditional 2878 train wheel holder. Available in black, red, reddish brown, dark brown, or light bluish gray. Trucks shown are suggested use; parts not included.