Dimensions: 30L x 20W x .75H in. Constructed from rubber. Black, non-toxic, and waterproof mat. Thick cushioning to alleviate strain on joints. Advanced non-slip base. Handle to hang when cleaning. Roller ball encourages body position movement. Standing for a long time can cause stress on your joints, but the Mingo Anti-Fatigue Mat with Roller Ball provides relief. The thick cushioning will lessen the weight to your body while standing, which takes out the strain and weariness in your feet, knees, and legs. The included roller ball encourages foot movement, which makes you switch your body position. This change will help your muscles for the short term, and for the long term it could reduce the risk of heart disease. This ergonomic, black mat is constructed from non-toxic, waterproof, and stain-resistant rubber. The non-slip base will stay in one place, even on marble, tile, or wood. The handle of this mat makes it easy to hang when cleaning. It is not recommended to wear pointed, high-heeled footwear when using this mat.