Crosstex Ritter B Tray Covers feature a polyethylene backing that prevents any seep-through, essentially making them moisture-proof. This creates an excellent protective barrier when the cover is placed waxed side down on the tray. The tray can also be used poly-side up for mixing materials, making them a multi-purpose tool for your practice.

These covers measure 8.5" x 12.25". Packaged 500/case.