Heavy gauge rectangular construction for easy stacking and storage. These pipette cans can be sterilized by autoclave or dry heat. (do not exceed 400 degrees f). Includes silicone pad on the inside of top and bottom to protect pipette tips. Satin finish surface of entire can for convenient marking or coding Silicone pads on inside of top and bottom protect pipette tips Material: 304 stainless steel .031" thick