Designed in 2012 to help with hay spillage, the Hay Tower I'm pleased to say was a complete success! I, however, got tossed a lot with life and never got to introduced them into the product line, until now. Designed like Hay Hammocks, all openings can easily enlarge to accommodate any size guinea pig or cuy so getting heads or bodies stuck is not a problem.
Bottoms have a solid fabric base to help with cleaning in and out of the cage, and moving the Hay Tower from hay box to cage.
Small - in testing
Medium - fits about ½ - ¾ of a pound (shown)
Large - in testing
(do not use with cats, ferrets, wild life, squirrels, etc... tails can potentially get caught up).