The Press Club is focused on making the highest-quality rosin tea extraction filters on the market at an affordable price. We only use premium nylon that is 100% food-grade and dye-free because we understand the importance of making contaminant free rosin. Every bag is backed by The Press Club Zero Blowout Guarantee so we'll replace any bag that doesn't hold up. All our bags have been extensively tested to prevent blowouts with any amount of heat or pressure. All bags are pre-flipped inside-out so they're ready when you receive them.