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-isolated shelving for your gear Blok is a division of the Monitor Audio Group , so they understand audiophile gear. They carefully crafted their Stax 2G modular rack system to eliminate performance-robbing vibrations. This unit goes atop a Blok Stax 2G Base (sold separately). Vibration-absorbing silicone pads isolate the unit from the base, and two additional pads isolate the shelf from its supports. Need more dampening? The supports are hollow and can be filled with acoustically inert material like sand or shot for added mass and resonance control. What's in the Box: 1. Shelf 2. 2 Shelf supports 3. Four M10 bolts