This C-M0.2 Sapphire Wafer Substrate comes with 25 pieces and a protective case. The host crystal is made of high-quality sapphire, ensuring excellent performance and durability. It is perfect for use in laser rods and crystals, lamps, bulbs, and laser components. In addition, it is ideal for medical and lab equipment attachments and accessories, healthcare, lab, and dental applications, and business and industrial purposes. With its superior quality and reliability, this product is a great choice for those who need a reliable and high-performance wafer substrate.