Specification: Item Type: Bicycle Seat Cover Material: TPU + Polyurethane Fiber Product Color: Black Product Size: Approx. 28x22 cm/11.0x8.7 in Air Sac Thickness: Approx. 3 cm/1.2 in Product Weight: Approx. 186g Maximum bearing capacity: Approx. 130 kg/286.6 lb Installation steps: 1. Cover the entire saddle and fix it in front, back, right and left; 2. Tighten the telescopic belt to a suitable position. Inflation method: 1. Insert the inflation needle into the cushion inflation hole; 2. Continuously squeeze the inflatable ball to inflate; 3. If there is too much inflation, press and hold the deflate button to deflate properly. Package List: 1 x Bicycle Seat Cover 1 x Manual Inflatable Equipment 1 x Manual