From the maker:
This BarConic® XL bar mat gives bartenders extra drain room for cocktail shakers to keep bar tops spill-free and sanitary. It's ideal for storing two shakers, such as a 28 oz and 16 oz pair, or a single 28 oz shaker with a mixing glass. Measures 12" x 6" and made of strong durable rubber. The rubber peg-like design of these bar mats will capture the spilled liquid and keep it safe off of your bar surface. They also securely grip your glasses, preventing spilling, sliding and ultimately breaking.