[Design]: Exercise Bike Resistance Knob compatible with most exercise bikes. [Material]: Constructed from plastic and metal materials for durability and functionality. [Feature]: Compact and portable design; smooth surface prevents hand scratching during use. [Easy to Install]: Simple to install and use, requiring minimal time and effort for setup. [Applications]: Suitable for a wide range of strength and fitness equipment, including exercise bikes. Type: 10 Gears / 8 Gears Color: Black Material: Plastic Package Contents: 1 x Exercise Bike Resistance Knob (Other items not included) Note: Due to lighting and display differences, the actual color may vary slightly from the image. Measurement may vary by +/- 1-3 cm.