Ceramic tumbler media makes the entire rock tumbling process more effective, improving delivery of rock tumbling grit, These rock tumbler ceramic pellets are safe to use with any rock tumbler.

(Photo by Mike Mulholland/Getty Images) SAN DIEGO – A 5.2-magnitude earthquake shook Southern California on Monday morning, sending boulders tumbling ... to watch out for rocks that tumbled ...

SAN DIEGO (AP) — A 5.2-magnitude earthquake shook Southern California on Monday morning, sending boulders tumbling onto rural ... motorists to watch out for rocks that tumbled down hillsides ...