Q:Whats material of the shower hanging shelf? It is made of carbon steel ,which is sturdy, non rusting,durable,resistant to moisture.The maximum weight bearing is about 10kg. It is coated with baked paint.It can be used for long time. Q: How to install the shower rack? It is eay to install,no need drilling or other insatll tools.It has suction cup design,clean and dry the surface first,hang the hanger on the doorand place the suction cups.Press the suction cups,they will be firmly sucked to the surface,it is finished. Q:What is the size of shower caddy hanging shelf? Single overall height :36.6cm/14.4in,Double overall height:74cm/29.13in. Hook width:4.7cm/1.85in,suitable for doors with thickness less than 4.5cm/1.77in Packing list: 1*shower hanging shelf+1package* accessories After tidying up,it is ordely and tidy 1.The anti-screw is light weight and flexible,and easy to install 2.It is with raised fence which can prevent the bottles falling off 3.The bottom hooks can used for hanging towels 4.Multiple suction cup design,it is strong load bearing Shower Basket Shelf Bathroom Accessory,Shower Rack Organizer,Shower Basket Portable,Shower Shelf Suction Cup,Shower Caddy Hanging Shelf With Hooks,Bathroom Accessory Organizer