U-Mark 10584 Red M1 Fine Line Permanent Marker, 0.8 mm Tip, 0.43" Diameter x 5.51" Length, Paint Pen (Pack of 12) Especially designed for laboratory, industrial, construction and professional use Extended cap-off time ensures you can use the marker after the cap is left off (re-capping may be necessary) 7/16" diameter aluminum body is easy to hold when marking small items such as glass slides, plant tags, film, labels and tools Resists laboratory and industrial solvents such as xylene and ethanol Made in Japan