L1 Green snap-off blade knife from Olfa is made from 100% recycled materials. The L1 snap-off knife is the best-selling hobby knife on the market. The L1 Green knife is a versatile hobby knife designed for cutting thick materials in a variety of industries, construction and DIY projects. The Olfa L1 Green knife is made from 100% recyclable material, with a screw lock that provides a secure lock of the knife blade.