Includes 3 sets of 20 cards each. Perfect for keeping skeins of thread in pristine condition without becoming a birds nest, especially when spending 8.00 or 10.00 on a skein of nice silk thread. Works well with Gloriana Silk, Belle Soie, NPI silk,Vineyard silk, Silk n Ivory, Waterlillies, Watercolours, Pepperpot silk, and others. Manufactured by Rainbow Gallery to help keep stitchers organized with like bobbins for storage. Pictures of threads are shown as a before and after scenario to illustrate the organizational benefits of the cards and are not included with this listing.