These Grindhouse Bamboo Pollen Sifter Boxes are made with a 3-part design including a magnetic lid, 125 micron sifting screen, and a magnetized tempered glass collection tray. The collection tray has dark colored tempered glass so you can easily see your trichomes. Made with a finished bamboo construction. Comes in Small (3"x5x1.5") and Large (4"x6.5"x2") sizes.