[Design]: Exercise Bike Resistance Knob for most bikes and Exercise Bike.[Material]: Made of plastic and metal material, and functional.[Feature]: The knob small and portable, will not scratch your hands due to winding.[Easy to install]: The knob is easy to use and quick to install, it will not take up too much time , and it is very convenient.[Applications]: The Bike Knob Exercise Bike Accessory is widely suitable for strength and fitness equipment, exercise bikes, etc. Type:10 GearsColour:BlackMaterial:Plastic Package Contents:1 * Exercise Bike Resistance Knob Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 273 hours.