You don't have to use 3" x 5" (7.6 x 12.7 cm) index cards, but they
look neat and professional when printed by a computer printer or
typewriter.
We have used plain white index cards, neon cards, and just pieces of paper, but regular paper does not hold up very well in poor weather conditions. We think index cards work the best. Neon cards are the most visable.
A pack of 100 neon cards costs about $3.00.
If you have any questions or comments about string, please e-mail me.