They work well but the straw they contain is absorbent and make sure your birds are dry before using them and don't use them on a wet day , they just don't shrink because they shouldn't shrink. HOWEVER, as they say, when it was good, with no rain or moisture, they worked amazingly. Make sure the water is hot. 190 degrees worked best for me. And I will be using them again now that the learning curve is over. There are no nice and thick holes, and they bang around hardened and still not split.
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