Drive Bays:5.25" x 4(EXT) 　　　　 3.5" x 1(EXT) Mainboard:ATX & Pentium 4 Expansion slot: 7 Optional Front USB & Multimedia port Thickness:0.5mm Dimension:410 x 180 x 400mm Packing size:465x250x535mm 20 container:460pcs 40 container:1250pcs 40 HQ container:1345pcs msn chenphilip168(at)hotmail.com