These cuboid needle tips are designed to be a handy addition to your interchangeable needle set. The square cross-section shape gives way to perfectly tapered birch wood needle points that are elegant, lightweight, strong and flexible. The unique ergonomic shape provides comfort to the hand and yields uniform stitch formation. Shorter in length than the regular interchangeable tips, these special tips are designed for 16" cables. You can also view all Knitter's Pride Cubics Special Interchangeable Needle Tips (for 16" cables) Needles.