Built with industrial grade Polyamide Nylon 6 and ceramic parts for enhanced durability.;Improved 2016 conical burr uses a new aerodynamic design to grind beans 18% faster than previous burr versions.;Easy to clean and rust-free.;1 burr assembly included in each pack. Designed to fit 2015 onward versions of the JavaPresse Manual Coffee Grinder. Using this burr for other brand grinders will cause damage over time and is not covered under warranty.;All Grinders purchased after July 31st, 2016 have the improved burr installed. 12-Month Product Guarantee.