Our 220 micron rosin press bags are mean’t for thicker flower material. The reason our 220 micron squish bag size is popular is because this micron size has the lowest risk for blowouts on flower material. You can trust our durable double stitch rosin bags to prevent blowouts for thicker flower material. Our bags are heat resistant up to 375 degrees F and reusable. Check out the blog section of our website to learn more.