https://www.zgallerie.com/p-5868-acrylic-square-napkin-rings-set-of-4.aspx?source=myregistry
Simply square, these acrylic napkin rings will add a unique angle to your table setting. A clean slit carves out an interesting dimension for these clear, durable napkin rings.
5.6 cm x 5.6 cm x 2.4 cm