The chain is about 5 1/2 inches long. The pendulum bob is about 2 inches long, 9/16 inches in diameter, and weighs 24 grams. This would be considered a medium weight metal pendulum.
The chamber is about 7 mm (9/32″) diameter and 5 mm (3/8″) high. More space is available in the chamber cap. The BBMM1 has a smaller chamber than the BBMAUS.
The Pendulum Bob is Stainless Steel. The Chain is Vibration-free Stainless Steel design.