A 35 gram weight intended to be used with the "Leonardo's Reciprocating Motion Machine" model (this is an estimated weight for stainless steel, actual value can change due to the variations in the manufacturing process).
Attach a bended copper or steel wire – or just tie a string directly – in the existing hole to make it hang from the machine. Perfect in a rough finished stainless steel or antique bronze glossy.
Link to: Leonardo's Reciprocating Motion Machine