The OX Tuff Carbon Marking Pencil Value Pack is great value for your money! This set contains the OX Tuff Carbon Marking Pencil, a tough marking pencil with an automatic lead feed that can write on almost any surface and 4 lead replacements. FEATURES Writes on almost any Surface including but not limited to: wood, glass, steel, damp wood, rubber, plastic and stone Ideal for deep hole marking and general-purpose construction marking. Stainless steel lead feed tube - Diameter Of lead 2.8 mm Made From High Quality PP/ABS/Stainless Steel Materials Includes black, red, white and yellow refills. TUFF CARBON - TILE LEAD (10PK) FEATURES DESIGNED FOR TILE � Material and Color of Pencil Leads specifically designed for optimal performance when working with Tile. THREE COLORS � Pack includes 3 Red Leads, 3 Blue Leads, and 4 White Leads. CARRYING CASE � Leads come in a compact case. PRECISE � Sharpen for more precise marking than traditional tile pencils. TUFF CARBON PENCIL � Leads made to fit/refill in OX Pro Tuff Carbon Marking Pencils. 2.8mm diameter lead with sharpened tip.