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This silicon wafer holder is designed for 4 inch diameter wafers.It can prevent precision wafer or substrate from damage and contamination during shipping and storing. Each complete set includes three parts: container, cover and spring 100 class cleanliness silicon wafer box ; material: Polypropylene The wafer container is packed in plastic bag Your purchase is backed by our exclusive 30-day free warranty - we will offer a free replacement or refund if anything goes wrong with the product.