The jacket hooks and eyes in size 9 are the right fasteners for heavier clothing such as jackets and traditional costumes. In contrast to buttons, the silver or black coated iron hooks and eyelets can be sewn into clothing almost invisibly, so that the design of the fabric is not affected by button plackets. Jacket hooks and jacket eyes are available from Prym both as a set in packs of 12 and separately in boxes of 500 pieces each. The fasteners made of rust-proof iron are absolutely burr-free and can be opened and closed easily.