The size 4.0 is the factory needle for your machine. Stick with the original which reduces batting bearding and skipped stitches and tension problems. These are SHARP needles (designated R on the package) for regular quilting on cotton and batiks with regular 40 weight threads.
Order 1 and you’ll receive a pack of 10 needles.
Order 10 and you’ll receive a shrink-wrapped cube of 10 x 10 packs (100 needles total)