So I seen this Exo Terra stuff at a reptile store here in town and have contemplated picking it up every time I go in. I love the look of moss and its moisture holding properties but do not like the chance of ingestion part. I do not think that it is machine washable do to the nature of how it is constructed to look like moss. The box implied that you should hand wash. It was $10 for a 18"x18" piece so not horribly priced I guess. I am wondering how ever can a frog get impacted if it eats strings? It appears to be contructed of a bunch of little strings that are intertwined.