The Good Ol' Menstrual Cycle Poster by I Heart Guts
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This 18" x 24" poster designed by plush body-organ makers I Heart Guts, and is printed with soy ink on 30% recycled paper in the USA.
Distributed by DKE Toys ~ the poster retails for US$15 per (do check with your fav retailers), or you can order them direct from I Heart Guts here.