Compatible models: Apollo P1200, 300, 310, 320, 330, 340, 340cbi, 340cm, 340cv, 400, 400L, 420, 420C, 500C, 540, 540C, 550, 550C, 560, 560C, C, C510, C520, C540, C550, C550C, C560, C560C, 310, 320, 540, 540C, 550, 550C, 560, 560C Color: Tri-Color Print yield: 250 pages at 5-percent coverage Non-refillable Model: NL-1x HP 25 Color Set This item is not returnable