10 inch circumference 2 1/2 inch diameter It is a good idea to measure your wrist to ensure a perfect fit! Bakelite is a brand name for a type of early plastic known as phenol formaldehyde resin. It was developed in 1907 by Belgian-American chemist Leo Baekeland. Bakelite was one of the first plastics made from synthetic components and is known for its heat resistance, electrical non-conductivity, and durability. It was widely used in electrical insulators, household items, jewelry, and radio and telephone casings during the early to mid-20th century. (B2)