On-Stage RDF4000 4U Adaptable Rack Drawer FoamA perfect fit for our rack drawers, our RDF4000 4U Adaptable Rack Drawer Foam keeps gear organized and protected. Featuring 0. 75" perforated blocks that pull apart by hand, the tray allows you to easily create a cushioned chamber specifically sized for your equipment. Firm yet flexible, the foam holds gear in place to prevent scratches and impact damage. The tray can be used to safeguard one device or lay out multiple spaces for holding a wide range