Premium Materials: The deep tip markers are made of high quality metal and rubber, which is sturdy, precise and practical. Comes with an integrated sharpener that screws onto the top of the marker. Deep tip markers are always sharpened for good accuracy. The gray lead is made of graphite, while the yellow and red lead is made of paraffin for durability and water resistance. Area of application: this pencil can be used on different surfaces such as metal, plastic, glass, wood, paper, concrete, drawing on dark surfaces with yellow and red pencil leads is no longer a problem. Product features: these carpenter pencils give you a nice, non-slip writing feeling when working on wood. The 2.8mm diameter combined with the deep hole marking and slim nib design allows the pencil to reach deep or narrow holes for marking and drawing. At the end of the woodworking pen Package content: 1 deep tip marker and 24 refills (two gray graphite refill boxes, one yellow paraffin refill box, one red paraffin refill box). The quantity is sufficient and well thought out, and will be your marking, drawing, DIY and woodworking. lucky meet