COLOR. Black & White MATERIALS. Cellulose Acetate DIM. 1.2'' Diameter ~ Medium sized hoop Hypoallergenic Post - Stainless Steel Cellulose Acetate Material ~ Much stronger and more durable than an acrylic material. Cellulose acetate is less brittle and wont break as easily. A renewable resource ~ essentially made from a wood pulp. It is the same material used for high-end eyewear frames. A fresh take off the classic tortoise shell hoop earrings.