This kind of pla clear flat bag is make from cornstarch materials,Website:http://www.biopacking.net, which means its suit for the environment policy at present. For packing cards , it is one of the best choice that it is totally clear and transparent, people can see the inner side through the bags which means it is a good way to protect the card.Product's details:1,Size: Customized2,Color: Transparent, Clear3,Print: Customized4,Samples: Need cost5,Thickness: 25 microns and 40 microns6,Materials: Pla7,Feature: 100% biodegradable8,Application: Can packing card9,Sealing ways: Flat knife or explosion-proof edgeProcess:For sealing way, if the size if less than 15cm, the process is default as flat knife. If the size is more than 15cm,the process is default as explosion-proof edge. Pls see attached picture:?Advantages:1, Pla 100% biodegradable and compostable products2,Testing reports for our products3,Years of professional manufacturer4,Final inspectio......url:http://www.biopacking.net