Thunderbolt (formerly Police Officer) Super Jumbos

Thunderbolt marbles have an opaque grey base with swirls of green and light blue glass on the surface of each marble.  They are iridized to have an oily reflective surface.  Super jumbos are approximately 42mm or 1 5/8" in diameter. They are sold in packs of 5 or 30 marbles.  Sizes may vary slightly.