Soap box plastic has two layers base raised portion to keep soap out of the water the detachable tray beneath soap container holds the drain drop. Keep surface beneath sink surface dry. The inner layer can drain off the water and keep soap clean dry and can keep the soap from being soaking. Waterproof and moisture proof it works better on smooth and hard surfaces. This soap holder has two parts the top container being removable easy to clean water falling into underneath box. You can install it anywhere needed. It is made of quality plastic so it is lightweight and pretty for holding soap sponge.