Features: This laser module is specially designed for laser engraving and cutting machine like 3018 engraver. Fixed focus-, no need to focus-, easy to use. With eye protection goggles can protect your eye from UV, when watch the visible magical- engraving process. Engravable materials: for MDF, balsa-, paper, wood, fabric, plastic, leather, plywood, foam paper, anodized aluminum, stainless steel mirror can be directly engrave. Cuttable materials: Cardboard, Nonwoven, Plywood, MDF, Acrylic, Some Thin Plastic Sheets Specifications: Item：approx 143x42mm/5.63x1.65in Material: Aluminum-alloy Weight:300g Power: 2.5W / 5.5W Package Includes: 1PC Laser Head- note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.