The Cali Crusher Slick is made from a ceramic material that provides a durable non stick surface. Cali Crusher OG 2.5" Grinder. Diamond-shaped teeth are highly efficient when it comes to grinding dry herbs easily, quickly, and effectively. The textured grip, it's easy to handle this grinder and use it without dropping it on the floor. The sifting screen is ideal for frequent smokers who prefer a bit of concentrated substance. A scraping tool is included with the grinder, so that it's easy to dispose of herbal dust from the pollen chamber. Aluminum material offers resistance to physical impact, making this product a long-term investment.