WL-2 Fresnel Lens wallet lens, this Credit Card size Pocket Magnifier carries in your wallet just a like a credit card always ready to use. Much thinner than a credit card Magnifying Fresnel Lens with storage sleeve.This ultra thin Magnifying Fresnel Lens comes with a storage sleeve. Wallet sized/Credit card size but about 1/4 the thickness of a credit card, Ideal emergency magnifier and Survival Lens/fire starter for campers and preppers.