It has a gold top and bottom, and the actual glass sphere glows with a greenish tinge. It has a chain, possibly to attach to a belt or to tie around a neck (Death said if Thomas weren't in bed by eight, Muscle Man would become a permanent part of his wife's jewelry collection).
- Muscle Man was inside it, but got out because Thomas was asleep by eight 'o clock.
- When Muscle Man became free from it, he grew, but his shirt stayed normal size.
- Like Death's Soul Ball, this also has a lime green tint.