31, hundredths-inches, 969, hundredths-inches, 2, hundredths-pounds, 260, hundredths-inches

Tobar Invisible Message Write and Reveal Spy Pens Set

Ensure sensitive information never leaks out by delivering a message using the invisible ink spy pen. The pen comes filled with ink made from compounds that appear invisible to the naked eye, but magically appear while under ultraviolet light.