ChewEase Pencil Topper is almost invisible and mess-free. Easily slides over the tip of a standard pencil to put self-regulation where you need it, making it readily available. Great for environments where chewing gum is not allowed. Made from medical grade FDA compliant USP class VI (this is the tubing they use for IV fluids etc.) non DEHP, phthalate free PVC. Measures 4 inches long.