Add-A-Mat secures different mats in a Gold Cube tray Want to try different mats in your Gold Cube? Now you can easily do it with Add-a-Mat -- the fastest way to swap out mats in your Gold Cube! This system, developed by the inventor of the Gold Cube, uses a flexible metal plate to hold down any mat using a tension plate. This flexible stainless claw mounts easily to the underside of the Gold Cube tray and applies constant pressure on a mat of your choice. No more gluing and stapling, just “cut to fit” your mat and the hold down system automatically grips the mat while you're busy getting gold. Simple to install: Attaches to bottom of Gold Cube tray with 7 screws (included). Works with all mats: Go ahead and try out different mats or mix and match! Easy Clean-up: simply slip the mat out for clean-up.