Geek Chic. Printed with the first 2940 digits of the calculation of pi =3.141593... in the classic Dot Matrix printer font on standard blue bar fan-fold paper! Mighty Wallet® is the original, invented in 2005, that launched a global trend of wallet designs made with Tyvek®. Be Original, Be Creative, BE MIGHTY! Tyvek® is made with thousands of interlocking plastic fibers that creates a thin material that is tear-resistant, water-resistant and recyclable. Made from a single sheet of Tyvek®, the mighty wallet is a slim, folded, eco-friendly, and vegan wallet alternative to old-fashioned bulky wallets. The mighty wallet® has no animal byproducts is a long-lasting sustainable choice that is great looking too.