Silvalume 11191 Knitting Needles, Straight, 10-Inch 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 Each needle is heat treated for strength and durability and polished for a velvety smooth finish The knobs feature a no-roll design and the US and metric sizes are clearly printed on the knob