Check the listing for details. 1/2" 15 IPS MRL 31J229 IEC 250 nwb Multi-Frequency (12 frequency) Calibration Tp. Condition: New. Listed at 349.95 USD. You are buying: One (1) 1/2" 15 IPS MRL 31J229 IEC (IEC1) 250 nwb (+3) Multi-Frequency (12 Frequency) Calibration Tape You are purchasing a brand new Multi-Frequency (12 Frequency) 31J229 Calibration Tape from Magnetic Reference Laboratory (MRL). The tape is 1/2" on a 10-1/2" metal reel. The speed is 15 IPS. The Equalization is IEC (IEC1).This tape will be at +3db (250 nWb/m).This This listing is for the MRL Calibration tape with the part number:31J229Alignment tapes, aka calibration or reference tapes, are required to properly set play back on any given tape deck. The alignment tape contains various signals, and array of frequencies, that let the operator setup a tape deck for playback prior to record alignment. We are an authorized dealer of MRL Tapes, which are very reliable. Please consult our resident experts if you have a question as to what alignment tape you should be using for your deck.This alignment tape is custom recorded on RTM SM911 by MRL. PLEASE LET US KNOW IF YOU WANT SOMETHING OTHER THAN WHAT IS MENTIONED ABOVE!For wow and flutter, velocity/speed, and multi frequency tape there are other tapes that can be purchased from us. Message us on eBay for questions and details about those tapes. In the event of a tape emergency, message us for expedited shipping. There are no returns as each tape is custom made with exception of replacement for defect.Buyer will receive the exact item(s) as shown in the pictures. If you have any questions, comments, or concerns, please contact us! We pride ourselves on providing excellent customer service. If you are unsure about purchasing an item for any reason, please do not hesitate to call us. We are happy to help ensure you find the right product! Please check our EXCELLENT feedback and order with CONFIDENCE