I have been using a Dymo label printer for a couple of years now and noticed recently that I was getting near the end of my original roll of plastic white label tape. I'm labeling books (inside) for a library and know I'll be going through hundreds of inches of tape in pretty short order. SO ... I ordered this product and, sure enough, days after the shipment arrived, the tape I'd been using ran out. I opened one of the 3 packages I ordered and dropped the refill into the printer and clicked it into place (I thought). I closed the hatch and printed and the label printed off center. Hmmm. I opened the hatch again and pushed down on the cartridge and heard it (finally) click into place. AH ... I hadn't pushed it in all the way the first time. I closed the hatch and began printing labels without any problems. Totally satisfied and a little bit wiser about proper cartridge reloading procedure. I would definitely buy again.