These are New Old Stock. They have been stored so the package may be a little beat up.
They appear to be leather but I no material listed on pack.

Elevate your footwear experience with the sleek and durable Griffin Boot Laces. At 40 inches (102 cm) in length and designed to be thin, these laces offer a subtle yet robust replacement for your existing shoe strings. The classic brown hue complements a variety of shoe colors and styles, ensuring a versatile fit for most of your footwear collection. Proudly made in the United States, these laces are constructed with a 5-eyelet configuration, providing a secure and tailored fit to your boots or shoes. Whether you're replacing worn laces or customizing your footwear, Griffin's commitment to quality ensures your shoes stay laced and looking great.