A standard 6 string tail piece, made in a zinc alloy (sometimes called Zamak)  - beautifully plated in either Gold, Chrome or Nickel, and supplied with (or without) either imperial or metric bushes, in a range of different sizes - plenty of variables, but ultimately, a very simple guitar part - turn up on most "non tremolo" guitars, and simply act as an anchor point for the strings before they travel over the saddles.

Material - Zinc
Zinc Weight - 50g