Uni-ball Jetstream Fine Point Roller Ball Pens Refills for Multi Pen Type -0.7mm-black Ink-value Set of 5

I saw a lot of reviews saying that the cartridges don't fit, and I was worried. tl;dr: Can confirm that this fits the MSXE510005.24FYI the MSXE510005.24 (not the product being reviewed) is shipped with 0.5mm cartridges, but I had trouble with smooth writing with the black cartridge, so I bought these to replace it. This 0.7mm cartridge writes well without skipping. It isn't individually packed as pictured in the product page, but rather in a small plastic bag. I don't really care about the packing as long as the refills work. These will most likely work with the MSXE510007.24 too because I'm pretty sure the body of the pen is the exact same.

Package arrived in perfect condition and on time. Thank you!

First of all, I was trying to order a product called "uniball jetstream prime" which is supposed to be D1 size. These are bigger, so I must have ordered wrong. BUT: I still tried to use these and the pen started not flowing a few minutes in. It is awful quality and I believe it's counterfeit. The tip smears (leaves gunky spots, do not run your fingers over). A waste of money and should be taken off amazon.

Great value, but b wrong refill for my clip-turn multi...will use for something else...

Works perfectly for the multi-color Uni Jetstream Pen (MSXE510007). I had no problems with installation. One tip that might be helpful is after unscrewing the body, press down the color you want to replace. Once it's locked in place, pull out the old one and put in the new refill. This helps with installation as you don't have to insert the refill cartridge as far into the tube (and might explain why so many negative reviewers thought it didn't fit; that or they didn't look at the supported model numbers clearly labeled on the package photos).

This only works with the 3in1 ir the 4in1, NOT the individual pen. And it is not eligible for return.So remember, when buying from overseas, read each word, they slip stuff in the lingo that you can miss and then you are left with refills for a pen you don't have

This is exactly what I needed. Make sure the model number is the correct one (SXR8007).

I had ordered three similar black ink refills for my pen before I found these ones (the right ones). The other ones I ordered were either too short or too fat for my pen. These refills are perfect--easy to replace, smooth to write with, and at a good price.