Ojime bead "Mice and cheese" carved of mammoth ivory with a titanium tube.
Diameter 20 mm, hole 4 mm. Fits bracelets (Trollbeads, etc., NOT for Pandora).
Ojime (jap. lit. "cord fastener") are a type of bead which originated in Japan. They were worn between the inrō and netsuke and are typically under an inch in length. Each is carved into a particular shape and image, similar to the netsuke, though smaller.