Review on SINGER 21495 Class 15 Transparent Threaded Bobbins, Assorted Colors Pack of 12 by Michelle Langley

, Wanted to clarify this after speaking to a Singer representative this morning. She confirmed that these are NOT the correct Class 15 coils and apologized on Singer's behalf. The company that makes the coils for the Singer made a large batch of these fake coils and they said the Singer couldn't recall the product because there are no lot numbers for things like coils. She explained that this will NOT damage your machine, but will/could cause sewing problems like nesting and loops. In my case, the only problem they caused was the thread cutter not working with bobbin thread (which is what drew my attention to the issue in the first place). Luckily I have Prime so I can return them for free However I would like to warn any potential buyers who take the time to read the reviews. If you look at my photo, the red thread spool is the 15th grade standard and the empty spool is a mismanufactured spool. You will notice a raised "ridge" on the flat side of the false spool. I hope this helps clear up any issues involved and helps people make an informed decision! You will notice a raised "ridge" on the flat side of the false spool. I hope this helps clear up any issues involved and helps people make an informed decision! You will notice a raised "ridge" on the flat side of the false spool. I hope this helps clear up any issues involved and helps people make an informed decision!