Susan Bates Silvalume Circular Knitting Needles Size 3 (3.25mm), 16 inches long tip to tip, plastic cable. Bates silvalume circular knitting needles are perfect for all your knitting needs. Each needle is made of lightweight aluminum and undergoes a special anodizing process that removes all surface impurities. The needles are heated treated for strength and durability, and polished for extra smoothness. They are designed for comfort at your fingertips!