100% Cellulose Acetate Biodegradable Acetate Size: 4.75" X 2" *****Glow in the Dark : Milk Color Only***** If your glow in the dark clip isn't glowing, hold a bright light source up to it for about a minute. It'll recharge it and make it glow again. If you want to glow in the dark stay longer, Please store in a dark place in order to extend the life of glow in the dark effect. -Cellulose Acetate- Acetate is plant-based biodegradable plastic in the simplest form. Cellulose acetate is made out of processed wood pulp, and also often regarded as nontoxic, nonirritant, and biodegradable material. Acetate is far more flexible and durable compared to conventional plastic that are fossil fuel based.