OK slightly humorous name but it's stuck. Comes from a 70s UK TV Series - I just remember one episode where a "New Ager" was following a ley line using a pendulum somewhat like this if a bit larger. At the time it was like Sci Fi to me . . . . .. . It's my personal favourite.
Each Pendulum comes in a Crystal Heart Satin Pouch.
Crystal 23 x 23 mm approx, total length with chain 210 mm.