Skin Skribe is one of the original surgical skin markers. With a prescision soft tip, it wont clog and stays needle sharp. The Twin Tip Surgeons Pen is a dual purpose pen, with a fine and broad tips. Use the fine tip for an ultra fine lines and and use the broad tip for medium lines. There is a built in ruler on the side of the pen This pen is non-toxic gentian voiet skin marker. Each pen is individually wrapped and pre-sterilized. You can remove markings from with alcohol.