The Aluminum Storage Cache Set is just perfect for everyday use on your key chain, backpack, purse or pocket. The waterproof quality allows you to use these storage tubes while doing water activities. The waterproof aluminum body has an O-ring seal and comes in blue, red, black, green and silver. They have a flat bottom, plastic lined interior and are 2 1/2” in length by 3/4” diameter. This is a pack of five assorted colors: blue, black, red, green and silver.