Features: Material: Made of silicone material, highly elastic, durable and non-slip. Rugged, highly durable and environmentally safe, with a long service life. Extra Protection: Extra protection for your seat post. Protect the seat post form dust, water, sand and mud, and avoid seat post surface scratching due to foreign material intrusion. Multiple Colors: Multiple color options for your selection to match your bike style. Rich in color, the jumping color can give the car the different effect. Function: Also could be used as seat post travel indicator for re-positioning seat post. Application: Suitable for road bikes, fixed gear, various and easy to install. Specifications: Name: Bicycle seatpost waterproof cover Material: silicone Color: Red, green, black, blue, yellow, pink, grey, purple, transparent Weight: 4.5g, 5.5g Packing: OPP bag Size: 25-30mm for 25.4, 27.2mm diameter seatposts 30-34mm for 30.4, 30.8, 30.9, 31.6, 33.9mm diameter seatposts Notes: 1. Due to the effects of light and shooting angle, the actual color of the item may slightly differ from the color shown on the picture. 2. Due to manual measurement, please allow 1-3cm measuring deviation.Thank you for understanding! Include: 1 Set of bike seat cover 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.