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Stainless steel T-pins are perfect for blocking your knitting. Just like the ones that come with our Knitter's Block Kit, these will not rust! **Please beware of non-stainless steel t-pins as they may rust when exposed to water and may damage garments. To determine if your pins are stainless, try the following tests Use a magnet. Stainless steel t-pins will not stick well to magnets. Place a few t-pins in a shallow saucer of water overnight. When you remove them the next day, you should see no signs of rust. Tin of 40 Stainless Steel T-pins.