Itty Bitty Soot Sprite and Konpeito.
Bottle measures (without cork) .75 inches high and a little over .5 inches in diameter. Soot sprites and konpeito are made out of polymer. The konpeito glow in the dark. Shake the bottle and they move. Charm is small enough to be worn a necklace.
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Due to the nature of the charm I do not recommend using it as a cell phone strap or keychain, please use at your own risk. Although very durable it is glass and if dropped repeatedly or crushed will break.
This pendant is not waterproof. If submerged in water the cork will become soft and may come out.