Firmness and size can be adjusted by the amount of water used,make you more comfortable. Suckers can be firmly fixed to the tub. Simply suck up the suction cup and place it in the desired position. Press hard to hold all suckers. Suitable for all spas and hot tubs.Comfortable and attractive design Please make sure that when using these seats the water in your spa is chemically balanced. If the balance is off the product may not stick to the surface. Made of PVC. Comfortable and attractive design. Bearing load :150 KG. Firmness and size can be adjusted by the amount of water used. Size: about 40*37*15cm