4U Shock Mount Rack Case with Elastomer Shock Absorbers Baby Your Valuable Rack Gear! SKB portable rack cases are designed with three things in mind: toughness to handle even the harshest handling conditions light weight for easy portability and innovative design to give you the best possible product to protect and transport your valuable gear. Whether you need a no-frills 4U case or a 14U over 6U rolling rack for your pro live mixer setup SKB portable cases have you covered. Extremely tough molded exteriors integrated handles strong and reliable latches and stackable designs are hallmarks of the entire line of road-tested lightweight dependable SKB portable mixer cases. The Shockmount cases feature an internal frame mounted on elastomer absorbers on all 8 corners. These shocks are designed to control the effects of shock and vibration on three axes. The ''sway'' space around the internal frame provides natural air conditioning... very important for delicate audio equipment. Plus the SKB Shockmount cases are half the weight of the old wooden cases. Features: 4-space Rackable Mount Depth: 23'' Front Rail to Back Lid: 23.5'' Lid Depth: 2.25'' Exterior Dimensions: 29'' W 27.5'' D 16'' H Weight: 36 lbs. SKB portable rack cases are lightweight and road-tough!