Katrinkles buttons are made of 1/8" bamboo plywood, which is sustainable, lightweight and strong. Your buttons won't be indestructible but can withstand a lot of wear and tear, including going through the washer and dryer (if your garment can).
Regardless of material, each Katrinkles item has been hand-sanded to smooth out any rough corners and washed to remove any residue from laser cutting. Because bamboo and wood are natural materials each item may vary slightly.
Button Care and Use
Bamboo buttons can go in the washer and dryer, but may last longer if they're hand-washed and/or dried flat.
When stitching buttons with more than four holes: If you're sewing them in a place where they will be functional, you may want to fill in the outer holes first and then tack the button down onto the garment using a few of the holes towards the center. If the item is for a baby or toddler, you may want to stitch the button onto the garment using all of the holes to ensure it is more secure. If your yarn is thick or you are using the 3/4" buttons, you may want to stitch the button using one or two plies of your yarn. Embroidery floss works great too and has a different sheen than wool.