developed by ANAC commucation Ltd., it' s assemble plastic one,total packing size is : packing size: 44*20*19CM case size: 44*18*42CM Main Board ATX / MICRO ATX CD ROM Space 4 HD Space 6 FLOPPY Drive 1 Front Port 2 USB 2 Audio Fan Space Rear 2 80mm Diameter Fan Space Front 1 80/120mm Diameter N.W 3.1KG W/O Power Supply G.W 3.2KG W/O Power Supply 20'' CTR 1452 40''GP 3146 40''HQ 3894 it means can save space when you delivery ,also save money for you,anyway,it as strong as the stander one,they are builded in 2.6mm panal.welcome to contact us for it more informations.thank you so much.regards.