Stable， Safe， and Durable: The PP plastic sheets are tightly locked in place by quality ABS connectors for firm support， allowing each cube to hold up to 22 lb of clothes or shoes. Plus， anti-tip devices are included to provide extra stability and ensure safe use.Customize as You Need: The interlocking system and included spare connectors allow you to stack and expand the storage shelf into different shapes to fit your space. Free your imagination to create more possibilities with this classic shoe rack!