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Procision Perlite Mega Chunk is cut with a four mesh screen leaving all material to retain #2. Perlite ore is a naturally occurring volcanic glass containing a small percentage of water. When that ore is introduced to tremendous heat the glass liquefies and the trapped water expands creating a remarkable and versatile material. In an ongoing quest to improve the quality of our products we recognized the opportunity to begin producing another of our own materials. Success at a new venture is never easy but we're really excited about the quality of our production.