The Nucleus Paragon Chilling Rock, designed to capture the aromatic volatiles in coffee, alters coffee origins you thought you knew well and allows you to appreciate them in new ways. These pebbles are designed for use with the Paragon Brewing System and come in sets of 5 or 25 so you may brew back to back. These cooling pebbles are made of titanium-coated stainless steel and are extremely durable. They are packed with a high-density liquid on the inside, which keeps them cooler for longer than alternatives such as whisky rocks. The Nucleus Paragon Chilling Rock is also meticulously engineered to guarantee that the extracted coffee is cooled quickly and uniformly as it travels through. Nucleus Paragon Chilling Rock Features The Chilling Rock is designed for extract chilling. It cools the extraction to collect aromatic volatiles, resulting in more fragrant and flavourful coffees. Stays colder for longer - The rock's high-density liquid helps it stay colder for longer. Even extract cooling - Designed and designed to uniformly cool your coffee extractions. Long-lasting - Titanium-coated stainless steel. This product Includes: 1 x Set of 5 Nucleus Paragon Chilling Rock or Set of 25 Nucleus Paragon Chilling Rock Specifications Materials Stainless steel, titanium, gel core Diameter 45mm