These bobbins are sold in a box of 144 pre-wound bobbins. They are white 60wt polyester thread on class L bobbins. The bobbins are either sideless or paper/cardboard sided.
Class L bobbins fit a number of different domestic sewing machines.
There is a separate listing for class 15 plastic pre-wound bobbins if your machine does not use Class L. We do highly recommend using the correct size bobbin for your machine for best results.
These bobbins are also available in smaller packs of 24x for $15.00. Please check out the posting for this.