Each cube size is 11.8" x 11.8" x 11.8" (30 x 30 x 30cm), consisting of polyethylene plastic sheet, sturdy metal frame and ABS resin connectors.This cube is designed for storing home items, clothes, books, personal favorite items, etc. Each cube holds up to 15Lbs, so please don't put something too heavy on it.Whether every cube sheet get well locked decides if you can get a strong structure. Our connector is made of ABS resin, inside is multilayer lock design so it won’t easily slides out. So we suggest you lock the sheet in deepest layer to get highest stability.