300 Micron Tube Hop Filter 1" x 14" with rubber end plugs. Dry hopping in your glass carboy was never so easy! The 300 micron stainless steel mesh allows hop oils to flow into your beer but keeps the hop pellet material inside. No more problems racking and having those pesky bits of hop flakes going into your bottles or kegs. Simply rack from your carboy, invert to remove filter, remove end plugs and rinse out with water! We do not recommend this hop screen for plastic carboys, while the mesh is not rough, there could be some rubbing as you invert your carboy to remove the filter and you could develop minor scratches in the throat.