The cage door design incorporates a 3" x 5" identity cardholder; feeder and water bottle openings are located here as well.
"J"-type feeders with bottom and sliding retention clips are standard-use items with the Series 839, 840, and 841 cages.
A optional flooring type called UniRelief Flooring is now available. This flooring is completely cagewash safe and provides a warmer smoother surface.
| Code # | Dimensions | Animal Space |
| 839 | 18" W x 25" D x 16" H | 3 sq. feet |
| 840 | 24" W x 25" D x 16" H | 4 sq. feet |
| 515 | 27" W x 28" D x 16" H | 5 sq. feet |