EVOLV Rosin Press Bags use only 100% food-safe nylon mesh and thread for the seams. This makes the bag and seam extremely strong to protect against blowouts. There are no chemicals or dyes in the material. Each rosin press bag will hold 10-20g of material and has inside-out stitching for maximum yield. For best results, aim to press at 1000-1500psi and limit each bag to 20g of material. For less than 10g of material, bags can be cut or folded. EVOLV Rosin Press Bags are designed to withstand heat and pressure. The softening point of the material is 374°F (190ºC). The melting point of the bag is 428ºF (220ºC), but for best results we recommend pressing at 180-240ºF (82-115ºC).