The 22-516 is a 4-1/2 x 6 x 1/16-inch prototype board made of perforated, bare phenolic material with punched holes. It does not have any copper cladding and is ideal for prototypes, breadboards, hobbyist, or scientific projects. Suitable for educational, hobbyist, and industrial applications, this tough phenolic board provides a reliable platform for building and testing electronic circuits.