Premium materials: Deep tip markers are made of high-quality metal and rubber, which are sturdy, precise and practical. Comes with a built-in pencil sharpener that screws onto the top of the marker. Deep point markers are always cut for good precision. The gray lead is made of graphite, while the yellow and red lead is made of paraffin for greater durability and water resistance. Scope 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 tip design allows the pencil to reach deep or narrow holes for marking and drawing. On the end of the woodworking pen Package contents: 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. luckymeet