Microtex or sharp needles have a sharp point like jeans needles but are available in smaller sizes. Use for microfiber to top stitch lightweight tightly woven fabrics.
Twin needles (Double needle) have two seperate needles mounted into one shank, with a flat side on the shank of the needle and come in a variety of sizes. Use for decorative sewing, top stitching and twin needle tucks.
Universal needles have a slightly rounded point with a flat side on the shank of the needle and come in a variety of sizes. For general sewing in a variety of fabric types and weights.
Top stitch needles have a longer distance from eye to butt, large eye and large groove. Suitable with thick yarn, eg buttonhole yarn and decorative yarns.