mechanical pencil: unlike other colors, silver is more suitable for marking darker steel, our round refills are less erasable than soapstone pen. silver solid metal maker refills can be widely applied for oily, wet, rusty metals and so on, which is suitable for pipe fitter welder, fabrication, steel construction and even woodworking. Each welders marker has been pre-filled with a refill, you can use them in different places, the rich refills extend the use time of the pencils Built-in sharpener for marks: the pencil sharpener is screwed into the top of the mechanical drawing pencils, which 't get lost either and your mechanical pencil be sharpened for . You can press pen cap to get refill, easy to use. Comfortable design and easy to control: handy pen-style design with convenient pocket clip, weight balance and a comfortable non-slip knurled aluminum grip which provides maximum control. The metal mechanical pen has a 3 claw tip that can hold the refill stronger and protect it from breaking effectively; You can also adjust the length of the refill quickly to meet your different needs Wipeable and conspicuous: these silver pencil refills are water soluble and can be wiped off with wet cloth when you mark wrong or make the place more beautiful and traceless; Drawing on a dark is no longer a problem, Manufacturer: Jnchdghwa