Features: Durable construction,these penlights are made from anodized machined aircraft aluminum,which makes them won't wear out overtime-and withstand drops and bumps. Easy to use,designed as simple structure, push-button on/off, easy to detach and install penlights.not include batteries, no-hassle using them once received pen lights. Pupil gauge and ruler marking,plating the markings for pupil gauge and dividing ruler in penlights, achieve visible diagnosis references for nursing students and doctors. Lightweight and portability,lightweight penlights,sleek-and delicate shape,brings enough portability for nurses and doctors.with metal clip, convenient for long-time carrying and using. Versatile application,aluminium alloy penlights,available for check-ups of nose, mouth and ears. also, these pen lights can work as tactical-light for outdoor camping and home electrical repair. ( warm tip: please do not shine the penlight directly into the eyes because of the intensity of the light.) Specifications: Material:Aluminium Style:White,Yellow Color:Silver,Green,Red,Pink,Blue,Black Note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the picture may not reflect the actual color of the item. Package includes: 1 Piece LED Penlight