1. SUITABLE FOR: Our step gliders can be used indoors and outdoors and are suitable for various surfaces, such as carpet, concrete, tiles, and grass. Regular replacement is recommended as heavy wear may cause damage. 2. SIZE: The glider is 5cm in height with an inner diameter of 2.82cm, designed for pipe rods with a diameter of 1 1/8 inch, making it ideal for most walkers. This model fits 11/8 inch and 1inch rods but is not suitable for 3/4inch models. Please verify the size before . 3. PACKAGE INCLUDES: You will receive 4 walker ski gliders. These accessories provide stability and ease of movement for individuals with limited mobility, helping them walk more steadily and effortlessly. The quantity ensures your needs are met. 4. MATERIAL: Made of quality plastic, these gliders are sturdy once installed and feature a smooth bottom. They offer a stable base for your walker, reducing the risk of falls and injuries while promoting smoother and more effortless movement.