J & P Coats Crochet Nylon Thread J & P Coats Crochet Nylon Thread is durable and lustrous making it perfect for crochet or knit purses, tote bags, placemats, arts & crafts and much more! 100% nylon. Woven, comparable to a size 5. More of a heavy sport weight. 4mm. Suggested Crochet hook is G5. 150 yards. Machine washable, lay flat to dry.