ITEM NAME:100Mm Aluminum Polyurethane Industrial Encoder Wheel Measuring Wheel for Me J1R4 100Mm Aluminum Polyurethane Industrial Encoder Wheel Measuring Wheel for Me J1R4 Material: Aluminum + polyurethane Color: Green & Silver Inner hole size: 6mm Perimeter: 100mm 1.Use with rotary encoder to measure velocity and position 2.It have high resolution Package include: 1* Encoder wheel