Check the listing for details. PHONOGRAPH NEEDLE for Taper Lock Type C-1 Astatic MD-1 MD-2 MD3 Astatic ACD. Condition: New. Listed at 15.95 USD. Phonograph needle Duotone 543. Replacement for Astatic MD-1, Astatic MD-2, Astatic MD-3, C-1 type needle. Used in pickup cartridge types Astatic ACD, Astatic AC. For narrow groove records (mono). Tip: Jewel for LP. New old stock. Duotone Search my store titles AND descriptions. Enter your needle no., cartridge no., or brand name. E-mail for further help. Osmium...........40 to 60 hours play Sapphire..........80 to 100 hours play Diamond LP.....800 to 1000 hours play Diamond Stereo...400 to 600 hours play IF YOU ARE PURCHASING A NEEDLE Model numbers are provided in manufacturer's references for the cartridge they installed in those models. If the cartridge has been changed by a dealer or user, this needle will not be correct for the model numbers listed, as it is the cartridge that determines what needle is needed. Be sure it looks like your old needle.