As indicated on the front labels, these high-yield (HY) cartridges are built to replace the Dell C2660 HY series. They are specifically designed for use in the following Dell color laser printer models:Dell C2660dnDell C2665dnf Top Box: Cyan (Blue label block)Second Box: Magenta (Pink/Red label block)Third Box: Yellow (Yellow label block)Bottom Box: Black (Black label block)
