This is a set of 3 First Impression Music (FIM) 305 Isolation Bearing system. You can check the web for reviews. It's best used when sandwiched between two equipment shelves and they recommend a hard wood. They are in excellent condition. Includes the original box and manual. The manual has the directions for building an isolation platform. My price includes free ground shipping to anywhere in the continental US. Sorry, no international sales. I accept Paypal or Audiogon Express for payment. Thanks for looking!