Moss 4-Tier Industrial Bookshelf - Sapphire Oak Pattern & Black; The bookcase is made of 18mm thick quality manufactured and industrial metal. Edges of the furniture are banded with laminated first-class PVC edge banding tape. Overall, it is manufactured using eco-friendly and health-friendly TSE-certified materials. Assembly instructions and installation hardware are included in the package. For fast and error-free installation, product parts are numbered with stickers in accordance with the assembly guide. color: Yellow