➤ Punching ball training allows you to instantly release the pressure accumulated during your day's work and quickly relax yourself. When you feel Frustrated or anger, you can hit it to vent your dissatisfaction, which will make your life smoother. You can start your boxing training at home or in the office like a professional boxer.➤ Specifications:- Material: PU leather + alloy spring- Color: Red-white-black , Black , Black-white , Red , Yellow-balck , Red-black- High: 38cm (15 inch)- Sucker Diameter: 12cm (4.7 inch)- Ball Diameter: 16cm (6.3 inch)- Suction Cup: suction force 70kg/ 154lbs- Installation: perforated suction cup installation- Package: Speed Ball × 1 (Including mounting accessories)➤ Installation steps:1. Fill the sphere with air;2. Connect the sphere and the screw;3. Connect the iron frame and the suction cup,tighten the nut;4. Connect the spring and iron frame;5. Stick the suction cup base on the silicone suction pad. Complete.➤ Tips:* Because of the speed ball is handmade, the size may vary slightly (within 1-2cm).* Colors shown in pictures may slightly differ from actual product due to lighting and color settings.