These are scraps from cut-up pig leather. They are sold by the pound.
Our full-grain woodland pig leather hides are of good quality, and has color variation and natural marks characteristic of distressed leather, treated to look aged or worn out without losing its overall integrity. It will darken with use and develop a rich patina over time. The thickness of the leather is approximately 2 to 4 oz (1/32" to 1/16").
Pigs are not endangered. These are a by-product of the food industry.