Susan Bates Silvalume Double Point Knitting Needles. Made of lightweight aluminum, each Silvalume needle undergoes a special anodizing process that etches away all surface impurities. In addition, each needle is heat treated for strength and durability and polished for a velvety smooth finish. Each size is color coded so you can find the size you need at a glance. These 7in needles come in packages of four.