HRS (Harmonic Resolution Systems) is World famous for its superb line of anti-vibration components and systems. There are numerous reviews out there for their products, and reviewers usually wind-up buying the products and using them in their reference systems.
Find product info and reviews through the link provided.
For sale here is a current model M3 Isolation Base, granite shelf on aluminum base, measuring 21' x 23" with the "green" formulation polymer feet, optimized for equipment weighing 30 to 60 pounds. (13-27 Kg). Even if you want the feet for heavier or lighter equipment, you can find them through a dealer and put them on this shelf.
Retail is around $2000.00, but you can have this one for $1500.00. It is in excellent cosmetic condition also.
Email me for photos.
Check my Feedback on Audiogon under Golden_ears
Bank Draft, Money Order, email or wire transfer preferred. If buyer wants PayPal, buyer pays fees.
Includes:
original wooden box and packing materials. (Shelf weighs 62 pounds without the box!!)
http://www.avisolation.com/m3isolation_base.html