From the manufacturer

• 8-Pack refill lead for PH158, 8-Colour Pencil
• 2.0mm lead diameter produces extra-bold lines of consistent density
• Great for highlighting high cotton or linen fiber paper such as bibles, encyclopedias and dictionaries
• Includes the following refill colors (1 tube of each color):  Red, Blue, Yellow, Brown, Light Green, Orange, Pink and Sky Blue