Velcro arm strap. * 3 Panel sizes: 5-1/2" x 4-1/4", 3-1/2" x 4-1/4", 3-1/2" x 4-1/4". * Allows you to wear it on your wrist. * Replaceable pencil with safety leash. * 2 lead pencils and 3 O-rings included.