The Holyangtech company is focused on offering the highest-quality rosin extraction filters on the market. In addition to our proprietary stitching technology, all our bags have been extensively laboratory tested to prevent blowouts with any amount of heat or pressure. We stand by our product so we will replace any bags that don't meet your standard. All bags are pre-flipped inside-out for convenience."p""b"Main features: "p"25/37/45/90/120 /160Micron 2" x 4" Inch with 100pack,All Bags Pre-Flipped To Save Prep Time amp; Ready For Use "p"100% Food-Grade amp; Dye-Free Nylon | Solvent amp; Heat Resistant (up to 375Â° F) | Easy To Clean amp; Reusable "p" Our great Stitching Prevents All Blowouts Or Your Money Back "p"180-Day Return Policy and Satisfaction Guarantee "p"For Best Extraction Results Use The Press Club Parchment Paper, Filters (All Microns amp; Sizes Available) amp; Accessories "p""b"Our service: "p"Any problem or questions,you can feel free to leave message,we will give you a quick reply as soon as we saw,and any quality problem,we will send the replacement or refund as you requested.we have full confidence that you will enjoy our product and service.