Bubble Magic Rosin Bags are designed to help separate essential oils from plant material through the use of heat and pressure. Bubble Magic bags are highly durable and heat resistant, and may be used with both hand operated or pneumatic presses. Select from 10-packs/100-packs of 25 micron and 90 micron. Bubble Magic Rosin Bags come in measurements of 7″ x 5.5″ or 5″ x 2.5″.