This item is provided by Crutchfield.com and includes free phone technical support for the life of the product. Details on how to take advantage of this service will be included with your package. Should you have any issues locating information on how to contact Crutchfield Technical Support, please contact this website's Customer Service department. Vibration-dampening construction Add more storage to your Pangea Audio Vulcan audio rack . This shelf, like the ones in your rack, is made of 5/8"-thick vibration-dampening MDF coated in scuff-resistant vinyl. It can support up to 75 lbs. The four steel support tubes bolt together with the shelf to create a strong, ultra-rigid rack. Also works with Pangea's Vulcan turntable stand . What's in the Box: 1. Add-on shelf 2. 4 Support tubes 3. 4 Bolts 4. 4 Rubber washers 5. Assembly Instructions