The plastic material is really quite sturdy. It fits perfectly in the shoe rack, creating a practical space for storage, which makes organization easy. If you stack two or reduce the size, there's space both above and below, so using it allows for shoe organization that takes up less space and looks very neat. Assembly is very easy. Don't think it's too tight; just insert it into the groove. It's very sturdy, and the color and design are neat. For this price range, it's one of the best value-for-money products I've purchased recently. It's quite an innovative product. I'm satisfied and will use it well.