BAG IN BULK - It contains 40pcs micron bags that all are made of food-grade nylon mesh screen. | FLEXIBLE PETP SHEET - It comes with 2 flexible PETP sheets for loading material quickly, recommend to pre-press materials before filling into bags. | MICRON BAGS SAVINGS - All 2 x 4.5 tea filter bags pre-flipped to save prep time and allow cutting into 2 pieces to save bags with bottle teck style. | VARIOUS FILTER AVAILABLE - We offer 37 90 u are ideal for fine product;90, 120,160 u are ideal for flower. | BLOWOUT REDUCING - Remove excess blocks, use less material in the bag, apply the pressure slowly, pre-heat it first to get it melty before you start to apply pressure.