Features: EASY TO USE: No assembly required, just place the chairs legs in the correct position. Suitable for chairs with 4 legs (round, square and curved legs).Stretchable: The 4 legs can be rotated at any angle, and the length can be adjusted by stretching, which is suitable for most chairs.Anti-skid: There are anti-skid pads on both sides of the bottom, which is stable and safe to use and will not scratch the floor.Small and Lightweight: Easily folds for storage and travel.It is suitable for helping adults with knee pain, joint pain, arthritis and hip problems to sit and stand on their own, as well as those who need for extra help, such as children and the elderly.Specifications: Material: ABSSize Before Stretching: Approx. 32.6x32.6x16.2cm/12.83x12.83x6.38inchPackage Includes: 1x Chair Boosternote: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.