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These buttons are made from natural nuts! Corozo is also known as Tagua Nut.
You may enjoy taking a look at the The Fibre Company Terra Mildred Vest, Plymouth Encore Tweed Women's Headband, Malabrigo Rios Rib and Button Scarf, and Rowan Handknit Cotton Cobalt Cardigan kits all using Blue Moon Button Art Nut Buttons.