A small wide mouth type that is easy to work with. 10 Clear Blackout Bottles 27.6 fl oz (800 ml) (Diameter 10.0 x 13.0 cm)) with holes and filter features; Perfect container for breeding beetles and stirrup beetles. The clear bottle allows you to check the contents, so you can breed while observing. The cap is threaded and comes with a filter. Please fill the mat or broken bacteria block before using. Quantity: 10 pieces; Size (Approx.): Diameter 3.9 x Height 5.1 inches (10.0 x 13.0 cm); Cap Diameter: 3.3 inches (8.5 cm); Capacity: 27.6 fl oz (800 ml).