Professional Grade 

The most modern material in the line, and the most technically precise. Where jade and rose quartz need refrigeration to reach their coldest, stainless steel is permanently self-cooling: it conducts temperature faster and holds cold longer than any stone, with no preparation required. But the defining advantage of stainless steel is hygiene. It is completely non-porous, making it naturally antibacterial and antimicrobial. It's also hypoallergenic, virtually indestructible, and the most sustainable choice in the collection.