For sale is a 4-pack of Credit Card Sized Fresnel Lenses.

These make a great back-up fire starter for sunny days.  Carry one in your wallet and use it to conserve matches or firesteel.  With a little technique you can use this to ignite your tinder bundle.  Be sure to practice this skill before ending up in a situation where you need to rely on it!

Features:

• Each lens comes with a protective green plastic sleeve
• Constructed of flexible plastic so it won't crack or shatter in your wallet, pocket, pack, or kit
• Printed with the SURVIVAL mnemonic from US Military Field Manual 21-76-1
• Credit-card sized to fit your wallet, money clip, etc.
• Measures 3.25" x 2"
• Magnifies up to 4x