Wholesale High Quality 4 Inch Flat Test Film Silicon Wafer. Customizable Specifications: Material, specifications, and optical coating can be customized to meet exact needs. Multiple Diameter Options: Available in 150mm, 200mm, and 300mm diameters for various applications. High Precision Parameters: Features tight tolerances for TTV, BOW, and WARP ensuring high quality. Fast Delivery for Stock: Inventory items ship within 5 working days for immediate needs. Comprehensive Shipping: Supports DHL, Fedex, TNT, UPS, EMS, and SF for global logistics. Flexible Payment Terms: Accepts T/T, PayPal, and other standard payment methods. OEM and ODM Services: Full customization from samples available for unique requirements. Strict Quality Control: 100% inspection including visual and function checks on finished products.