* Plywerk are made with sustainably sourced bamboo and birch. Not sure which one to pick? Check out this Birch vs. Bamboo page. * Several rounds of hand-sanding provide a glass-like finish. * Comes with one or two keyhole slots on the back to make hanging a breeze. * All our products are handcrafted in our California workshop with 100% solar power. * We promise you will love your Plywerk, learn more about the Plywerk Promise here.