SUSAN BATES-Silvalume Double Point Knitting Needles. Silvalume needles have the broadest range within the Susan Bates family of 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 five and are available in US sizes 9 to 11: each sold separately. Imported.