The Brother Genuine CS-A3401 is a set of two carrier sheets each yielding up to 500 scans(1) that can be used for scanning fragile or odd-sized documents. Carrier sheets can help prevent damage to thin papers, folded records and delicate or embossed documents including photos and certificates. Brother CS-A3401 carrier sheets are specifically made for use with the Brother DS-640, DS-740D and DS-940DW mobile document scanners. Brother Genuine CS-A3401 carrier sheets are easy to use and intelligently engineered to work seamlessly with your Brother scanner to deliver superior quality and outstanding reliability. Use only Brother Genuine carrier sheets for consistent results. (1)Approximate up to 500-scan yield each carrier sheet (may vary by type of use).