RICOH Gel ink original Gel Cart.  GX2500/ 3000/3000S/3000SF/3050SFN/ 5050N/7000 Type GC-21Y yellow (405535) Gel Cart.  GX2500/ 3000/3000S/3000SF/3050SFN/ 5050N/7000 Type GC-21Y yellow (405535)