A fun and practical solution to stop thread from unraveling and tangling or becoming loose over time. Durable silicone rubber provides optimal flexibility. Suits most home sewing, quilting, and embroidery thread spools. Easy to use and reusable - will not damage or leave marks on your threads. 28 sets of 3, bagged and barcoded with one each of Pink, Blue and Purple. 14.6 x 15.9 x 5.2 cm (5 3/4″ x 6 1/4″ x 6″)