Product Description: These little containers make fantastic nano caches. Often mistakenly referred to as 'buffalo tubes', there are several colors to choose from to help blend into any environment or you can paint it yourself. Each 'bison tube' comes with a mini key ring and a waterproof tube inside. Measures 9/16" by 1 13/16". Click the Enlarge button to see all of our Bison-type containers side-by-side. Colors include Black, Blue, Green, Purple, Red, and Silver.