The SDLT cleaning cartridge is designed for use with SDLT drives. Use this tape as necessary, when the Use Cleaning Tape lamp of the drive is lit, or when a cleaning message appears during the use of backup software. SDLT drives use this tape as necessary, when the Use Cleaning Tape lamp of the drive is lit, or when a cleaning message appears during the use of backup software. It will provide approximately 20 cleanings. Part number SDLT-CL represents high performance Sony SDLT cleaning tape.