... with every other needle slightly offset to provide greater ink coverage7M1,9M150pcs/box11M1,13M1,15M150pcs/box17M1,19M150pcs/box21M1,23M1, ... together, one on top of the other, for maximum ink coverage.7M2,9M250pcs/box11M2,13M2,15M250pcs/box17M2,19M250pcs/box21M2, ... with every other needle slightly offset to provide greater ink coverage7RM,9RM50pcs/box11RM,13RM,15RM50pcs/box17RM,19RM50pcs/box21RM,23RM, ...