This  Banded Jasper Cab is approximately 11.9 x 33 mm thickness is 5 mm with a weight of approximately 3.18 grams per cab (total 6.36). The back of this cab is flat. There are two cabs in this package as they are a matching pair for instance earrings or matching rings to matching neckless's. 
 
Banded Jasper is opaque and can exhibits a variety of colors. It hardness is approximately 7 Mohs, and polishes nicely.