16 in. x 16 in. Shower Nichewedi prefabricated niches are fabricated from 1 2 in. Building Panels for strength and come in five different size options. The perfect fit for all your shower necessities, our niches install quickly and safely and integrate flush into the wall panel assembly with wedi fasteners and wedi sealant. Shelves, included in some models, are flexible and can be installed exactly where they will fit your design best. 100% waterproof and mold proof