PERFECT MATCH WITH STORAGE BOXES: Based on our star product - DIY cube storage unit, SONGMICS comes up with non-woven fabric boxes that fit the cubes perfectly in size (30 x 30 x 30 cm), no need to search through thousands of boxes to match, now they come together UPGRADED FOR FIRMNESS: Thickened plastic connectors and 16 mm metal tubing make a sturdy skeletal framework, 48 kg load capacity easily holds your cook books or organise little one’s strewn about toys; includes anti-tipping straps for double safety SIMPLIFIED ASSEMBLY: Tubes and plastic connectors come in single size and fabric in 2 sizes, that means less energy sorting the parts before assembling; includes a rubber mallet for easy assembly without breaking a sweat or needing a helping hand PERSONALIZED DIY: Interlocking design allows you to stack and expand the shelves for different shapes to fit your space; 2 sets can combine together to create more possibilities, as a clothes shelf, bookcase, toy organiser, or closet shoe rack