Product description: Size: 33cm Color: pink Material: PVC Package includes: 1 * yoga leveling mat 1 * pump 1 * ball needle Description: ADE BACK PAIN: Core training stands for a stable core. Strong muscles in the core of the body are an important prerequisite for combating back pain. The ball seat cushion is an ideal training device for strong muscles in the core of the body. STRENGTH THROUGH INSTABILITY: The balance cushion brings continuous instability in its use, which forces the inner muscles to be active, so they are trained. The degree of instability is adjusted by the degree of inflation with the supplied pump. VERSATILE USE: From classic use as a ball seat cushion on the desk chair to a training device for functional training, the knobbed cushion is suitable for beginners to advanced users. INCLUDING AIR PUMP: Each ball seat cushion comes with an easy-to-use hand pump, so you don't need anything else and can start training straight away. Be careful when inflating Insert the needle carefully into the valve at an angle so that you do not pierce the underside of the pillow