COLOR. Black & White MATERIALS. Cellulose Acetate ~ Renewable resources essentially made from a wood pulp. DIM. 1.2'' Diameter 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. Hypoallergenic Post - Stainless Steel Checkered pattern is purposely imperfect, each one will have a slightly different pattern.