Triminator Pre Press Molds allow you to quickly compact material to reduce production time. Triminator offers three sizes of Rosin Pre-Press Molds to choose from. Rosin Pre-Press Molds are designed to work with an arbor press or with the Triminator Rosin TRP Stack. These molds allow you to improve yield consistency and increase output. Compacted material moves less inside rosin bags reducing bag blowouts while nylon offers stretching to further aid in blowout reduction.