Sturdy Materials: These soldering pens are mainly made of high quality materials, which are strong and light, not easy to rust or break, providing you with long-term service Thoughtful Design: each pen is an automatic engineering pen, and is equipped with a pencil refill, which can be easily applied and replaced; The pen body has a clip, you can clip the pen to clothes or a book, providing you with a lot of convenience Metal Marker: compared to a soapstone pen, the 2 mm round refills of the construction pencil can lay out an illuminated marker that is not readily erased, and the reflecting marking may form a visible sign on metal and oily surfaces for welders and pipe fitters Wide Applications: this practical carpenter pencil can be applied to mark practically any material or texture, including oily, rough, smooth, wet, dry, icy, or rusty surfaces, and is appropriate for construction, vehicle, bowl, metal, plastic, glass, wood, and paper color:Mixed color Material:plastic Package Contents: 6 x mechanical pencils in 2 colors 8 boxes x refills(each box 12 pieces,total 96 refills) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.