Katrinkles stitch markers are made of high quality, durable and sustainable materials. Their 1/8" bamboo, birch plywood, cedar and cherry hardwoods are sourced through local Rhode Island suppliers. Each Katrinkle item is 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. All items are designed, created and hand finished in their studio in Rhode Island.