No complaints.I tried the off-brand refills and they were not smooth and ran dry almost immediately. THe FriXion ink is the best. Don't waste time or money on trying for cheaper ink.I use this product at work.I write a lot so these pens helpI love frixion erasable pens. They aren’t the best writing pens I’ve used and the ink goes quick, BUT the ability to erase is totally worth it. I regularly buy refills for my pens and will continue to.Nice and usefulLove these erasable pens!What can you say...it's a refill. Put it in the pen...it works.It's like the pen companies are following the inkjet printer companies. The ink tubes are about 2/3 full (if that). Marking a single set of highschool math tests and one pen is almost empty.Great product - extremely skimpy on quantity. Feels like a money grab. Get you to love and want the product but give JUST enough to make you come back for more. Maybe.I will not be coming back for more.Son para las plumas “cliker frixion” (las que llevan resorte). Excelente para estudiantes y profesores. Hay otros muy parecidos que se llaman “point”. Funcionan perfecto, yo las uso mucho y me dura un mes cada repuesto, pero vale la pena. Hay de varios colores, incluido rosa y violeta. Intentaré probar con las demás. No se debe exhibir al calor los apuntes que hagas con estas plumas, son termosensibles, se borran decentemente bien y sacan de apuros cuando te equivocas. Parecen de gel, pintan muy bien.I use my FriXion pens for journalling and other times when I may need to erase and amend text. While FriXion offers lots of pretty colours, Black-Fine Point is my default preference as it's consistently legible. Unfortunately it's also the one that is consistently sold out at my local stationery shop, so I bought this pack from Amazon. I love that the refills are both inexpensive and environmental, in that I don't have to throw out the entire pen each time the ink runs out. I hope Pilot considers paring down the retail packaging so that there's even less waste, but this is a great start.Los lapiceros originales que compré en mi ciudad funcionaron correctamente. El problema es que estos repuestos que me enviaron dejaron de escribir bien, al principio creí que era un cartucho defectuoso pero conforme fui cambiándolos todos presentaron el mismo problema, la escritura no es constante y pareciera que el cartucho está lleno de tinta pero esta no fluye bien en la escrituraI instantly fell in love with using my Pilot Frixion point (0.5) pen because I make a lot of mistakes when writing, but also want my writing to look neat. I purchased the refills not realizing they were 0.7 and my pen was 0.5. Also, this package doesn't say that the refills are compatible with the Frixion Point, so I was worried when they arrived. However, they fit just fine in my pen, and the thicker line doesn't bother me at all. Same great quality as the 0.5. Some people complain that the ink isn't "blackest-black" more of a grey (and that's true), but I don't mind this at all. I will probably get some 0.5 refills as well.