A picture doesn't really help. It doesn't give me a sense of scale or materials that were consumed. Here's my opinion (and I'm not a vet nor have I had any formal training in this area so take it for what it is) if it's smaller than a chinchilla dropping and round and soft plastic (most glow-in-the-dark plastics are) I think you might be okay. Although the colon is where the larger droppings are formed is larger in diameter than the preceding bowels intestines are very slippery and somewhat elastic. I can't tell you what the size limits are since the bowels are designed for fluid to flow through them and not solid objects which is why I think a vet consult might be good for you. They can instruct you on what to monitor for and manage the situation IF a problem may arise. In my layman opinion I would monitor for changes in behavior such as depression, and certainly watch the fecal output, food, and water intake carefully over the next 48 hours. If there is anything suspicious call the vet and have an x-ray done. If they find anything you'll have to make the judgement on how to treat it because that is going to be an internal problem. If it's any comfort to you my chinchillas have eaten plastic before (not that I've intentionally ever provided it for them) and have been fine. One chin ate a piece of rubber hose (probably the equivalent of a 1/4" section) that was part of his watering system that was improperly installed and was fine although I was pretty concerned. Another ate a piece of calcium tablet that I noticed in his droppings when I then determined it was unsafe without any problems. But I do know such things carry very real risk and the best thing to do is manage the risk as best as possible.