VS3 Burr ULTRA: Precision CNC-machined with 6-core 48mm Hypernova Burrs (HRC67), the VS3 Burr ULTRA takes grinding performance to a new level for both espresso and filter brewing. Hypernova Ti with Plasma Coating: Built from 440 stainless steel and coated with a thermal plasma spray, the VS3 ULTRA burr set enhances durability and heat resistance, keeping the cutting edge cooler during operation. This results in a sharp, precise grind over extended periods of use. Pre-Crushing Teeth: Equipped with pre-crushing teeth, the VS3 Burr ULTRA improves grinding efficiency and consistency, allowing for a more uniform particle size distribution, particularly at finer settings for espresso. Enhanced Clarity & Definition: Experience vibrant clarity, balanced body, and enhanced acidity in your brew. The additional finishing process removes surface imperfections, leading to a refined, clean grind and better overall extraction. Key Performance Differences Hardness: HRC67 Coating: Thermal Plasma Spray Pre-Crushing Teeth for enhanced grinding efficiency Improved espresso particle distribution at finer sizes Medium body, higher clarity, vibrant flavor, and balanced acidity Gen 1 Compatibility: Gen 2 burr sets are compatible with Gen 1 units however a different size bearing will be required. Please reach out to us with your order number and we can add this to your shipment.