Hand Sewing Needle Kit Heavy Duty Household Hand Needles for Upholstery Leather Carpet Canvas, The darning needles are made of durable stainless steel, which is corrosion-free with a nonporous surface. so it will last for a long time without rusting, These sewing needles are suitable for leather, blankets, thicker fabric, canvas, tarpaulin, also making bags, repairs basket, sofa, furniture, etc.