Brick Rosin Filters by Rosin Technologies are specially designed micron screens of various sizes for pressing solventless oil using the Rosin Technique. These filters are specifically sized to fit the puck made with the Brick Rosin Mould. This pairing provides the operator with a great method for fast and consistent packaging. Use the open side of the filter sleeve to insert your flowers or dry sifted material. Fill and cut filter sleeve to desired length. The 2.5" x 4" single use Rosin Filters are intended to hold 10 - 20 grams and withstand temps up to 300°F