Crafted From a Safe & Non-toxic Combination of Rubber & Plastic, the Sliding Retractable Pencil Eraser is Lightweight Yet Durable, Making It an Excellent Addition to School Supplies. It Caters to a Wide Range of Applications, Including School Students, Office Professionals, Designers, & Artist, & Offers Efficient Error Correction for Notes, Daily Writing, & More. the Shell is Designed with Smooth Edges & Corners That Wont Hurt Childrens. 3.15 Inch L x 0.79 Inch W x 0.39 Inchh,4 Colors for You to Choose From.