Package Content: 4 pieces of walker ski glides. Size: 5 cm (1.9 inches) high, inner diameter 2.82 cm (1.11 inches); compatible with tube shafts measuring 1-1/8 inches and 1 inch in diameter. Not suitable for 3/4-inch models. Please verify compatibility before purchase. Material: High-quality plastic with a smooth bottom surface; provides stable support and helps reduce the risk of slipping or falling. Usage: Suitable for indoor and outdoor use on various surfaces including carpet, concrete, tile, and grass. Replace regularly to maintain performance and prevent floor damage. Installation: No tools required; easy and quick to install. Color: Gray Dimensions: 50 x 80 mm Note: Color may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.