The Max Bait Tray System trays are all made with 0.080 aluminum in the USA with powder coat finish to help with durability and to reflect the suns heat away from your bait. These bait trays are easy to clean and lightweight. The Max Tray Bait trays are durable and hold up great in a salt water environment. Great for all types of fishermen whether by boat, yacht, surf caster, or even pier anglers. Helps with deck space on the boat. Some suggested uses are as follows, for 50 quart or less coolers use 3 trays and for coolers larger than 51 quarts use 4 trays, this ensures maximum freshness for your bait. The Max Bait Trays all come in various sizes and depths and match perfectly with many coolers. This tray is designed for boxed bait.