The VEX Robotics 2.75" Diameter Rubber Traction Wheel - 276-1496 Bundle Lot of 7 is a set of high-quality wheels designed for robots. Made of durable rubber material, these green wheels have a 2.75" diameter and come in a bundle lot of 7 pieces. Perfect for advanced building toy enthusiasts aged 12 and up, these wheels provide traction and stability for robots, allowing them to move smoothly and navigate various terrains. Ideal for adding a realistic touch to robot designs, these VEX Robotics wheels are a must-have for any robot-building project.