Oh, THANK YOU, THANK YOU, THANK YOU, to Jerry Z, for unriddling the cage opening!!! NOW it's wonderful, (whereas before it was a piece of useless JUNK). I've taken off one star from my rating because if you have to rely on a fellow purchaser's review -- or, worse, on Customer Service -- for instructions (and especially when those instructions are unobvious), then your product is faulty, due to its lack of instructions!YES: the cage IS openable (and at either end, too). Looking at the INSIDE rim of either endcap, rotate slowly until you see a gap in the ring of metal holding the endcap in place. Using two fingers of one hand, squeeze the two bars on either side of that gap, and the now-slightly-smaller ring no longer holds the endcap on firmly. With you other hand, you can now remove it.Pop your desired dice inside, then repeat the above instructions to allow you put the endcap on again. Voila! (Triumphantly pronounced, VOY-luh.) But, as Jerry Z. pointed out, all this should have been explained in a brief sheet of instructions. Sheesh!
Rating: [4 of 5 Stars!]