The ServoCity 4" Acrylic Disc Wheel (Red) - 2 Pack is designed for optimal performance on smooth surfaces, making it ideal for robotic applications. These lightweight wheels feature a durable acrylic construction complemented by a rubber traction ring with a 70 shore A durometer, ensuring maximum grip and stability. The traction ring is securely fitted over a deep cavity in the wheel core, preventing slippage during operation.