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The original was posted on /r/whatisthisthing by /u/LtCmdrBuzzKillington on 2023-09-09 00:31:20.

Original Title: Round yellow soft foam honeycomb, 3" diameter and 1/2" thick. Possibly purchased from a pet store. Very light weight. It was placed in a rat’s cage, and the chew marks are from the rat. We are worried that it killed the rat and so we are trying to figure out what it is.