Product description Size: 33cm Color: pink, gray, blue Material: PVC Package content: 1 *Yoga balance mat 1*Pump 1*Ball needle 1.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. 2.STRENGTH THROUGH INSTABILITY: The Balance cushion brings continuous instability when used, 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. 3.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. 4.INCLUDING AIR PUMP: Every ball seat cushion is supplied with an easy-to-use hand pump, so that you do not need anything else and can start training immediately. Be careful when inflating Carefully insert the needle into the valve at an angle so that you do not pierce the underside of the pillow 5.PREMIUM QUALITY: In accordance with our claim, we develop high-quality training equipment that is characterized by first-class workmanship. The ball seat cushion is made of high-quality, non-slip and abrasion-resistant PVC and of course free of harmful phthalates. It is also easy to care for and easy to wash off.