I love them, that was a gift a couple of years ago and still using some of therm, the go forever becaise they are wound so tight.

I am not familiar with your machine but just to point out something that these bobbins are the M size which are the large ones. I use this size on my long arm. I use the white nebs kind size L on my regular sewing machine and embroidery. I attended a seminar by a Viking embroidery educator and she advised not to use the prewound bobbins for embroidery as it affects the quality of the stitching. She said to try the same design with both our own wound bobbins and the prewound and notice the difference in quality. I haven't tried that yet but will sure do.

Not sure what a "spoil" is, but it's possible we're talking about different things. Bottom Line thread is designed specifically for quilting, piecing, and appliqué. There may very well be pre-wound bobbins for embroidery also, I'm not into embroidery so I can't say for sure. Bottom Line is 60 wt and very strong.

eta: I just figured out you meant "spool". Well, I use Bottom Line both on my bobbin and on a cone, so that solves THAT problem! :)

Thanks for pointing out the fact that there IS a difference between the L bobbins and the M bobbins, Charming. My machine uses the L bobbin which is also sold on that site (Superior Threads). In my haste for an answer, I linked to the M page by mistake. ;) The fact is, I already have so many beautiful threads, I think I'd better use them up before I buy any more. I'll just fill up a few bobbins to have at the ready but I definitely see some of these pre-wound in my future. The company has a number of videos on youtube which are kind of interesting.

I did use them all the time but only in embroidery as they are not the same weight as the thread you should be using to quilt with. Several years ago I was embroidering lace jackets for balls for the christmas tree and absolutely tore up my Bro1500 machine to the tune of $700.00. It still needs repair as I bought my Bro4000D instead. You could not give me the wound bobbin thread factory to use in my machine. By the was I was using plastic sided bobbins so donated several boxes of them to CareCaps for use in her 15 Janome Decor computer machines. She has never had a problem while I lost an excellent and expensive machine. It used floppies and that I really liked.

Do not make the mistake I made
Pre-wound bobbins from Superior Threads on metal are for appliquers; they do not fit Janomes
SuperBobs on cardboard are for machines - they last til the thread is used up, no problems.
I buy Bottom Line SuperBobs for my Jem Platinum and Jem Gold. BL is a 60 wt poly thread that lasts forever. I pieced a twin top with one bobbin. I am DEVOTED to them.
Be mindful of what others have already told you - L size is what you want for sewing machines; Ms are for Longarms.
I use Aurifil 50 wt cotton on top with the 60 wt bobbin; have for years, never a problem.

Bob has a page on his site that tells you which machines will take his pre-wounds.
http://www.superiorthreads.com

I use the cotton ones for piecing, and the poly ones for embroidery. I only use the plastic ones because many have had problems with the paper ones and they don't work with the sensors on computerized machines. They do make cotton ones for piecing and I like them they last longer than ones wound by my machine. I just buy beige ones for piecing

They have cotton ones that i buy from my LQS that are the same weight so this isn't true. There are embroidery one and regular cotton ones you just have to make sure you know what your buying

Boy, this sounds like the first class I took. If I had followed everything she said, I would not be quilting.

Thanks for the link, golly. In short, it says:

Superior Threads has many machine quilting threads consisting of four fibers: Cotton, Metallic, Polyester, and Silk. Each line offers unique quilting traits with a library collection of color palettes from which to choose from.
A #40 thread is the industry standard medium weight for quilting thread. A #30 thread is thicker/heavier than a #40. The smaller the number, the heavier the thread becomes.

Cotton

• King Tut is a #40/3-ply Egyptian-grown extra-long staple cotton thread. King Tut really is nature's finest thread. A beautiful matte finish for any quilt project. Available in 133 variegated and solid colors.
• MasterPiece is a #50 Egyptian-grown extra-long staple cotton thread. Available in 75 colors. Ideal for piecing and detail quilting.