What kind of pens do the Thunderbirds use to sign autographs?
The Thunderbirds prefer to use the Staedtler Lumocolor 318-9 permanent fine point black marker to sign autographs. It writes well on most surfaces, and is fade-resistant. This marker is made specifically for use in overhead projector transparencies and it suits the Thunderbirds well. The team refers to these pens as “F” pens, since the letter “F” is in bright orange on the cap and is also prominent on the body of the pen.
