Made of exotic fiberglass filled plastic. These letter openers can be driven through 1/2 inch plywood with minimal damage, needing only to be resharpened. Measure 1 3/16 inch wide, 7 3/4 inch long and blade length of 4 1/2 inch.Weight only 2 ounces. These letter openers can be carried under a watch band, in a sock, shirt or jacket. It can also be worn on a lightweight cotton string around the neck or taped anywhere on the body.