Uni-Ball UM151S Rollerball Pens Grip 0.7 mm Tip 0.5 mm Stroke Width (12 per pack) - Blue

I prefer these pens to any other, have used and bought as presents. Ink is very clear, good value

The media could not be loaded. Smooth writing, no bleeding through and dries quick. Love it! Got a pack with 3 blue, red and black to test. Will definitely order more.

Great quality pens, very comfortable to write with, ink is smooth and on point

I recently bought a pack of Uniball Signo UM-151(07) black gel pens at the bargain price of £8.99 for a dozen. They write very well and are comfortable to use during long periods of writing (exams!). If you unscrew the silvery bit at the bottom (nib) end, they are refillable.In a comparison against other black gel pens with 0.7mm nibs, the UM-151, together with Uniball's Eye Fine UB-157 performed better than others in my 'smear test'. Experiment was set up allowing 30 seconds for ink to dry before attempt made to smear script by applying water. Zebra's Sarasa and Pilot's G-2 performed badly, followed by Uniball's UM-207; but their UM-151 and UB-157 fared much better. So there may be some truth in their claim that some of their inks are waterproof.

Alway use a brand of fountain pens. The ink I've used is no longer available, and the pens don't work right without that. Therefore borrowed one of these and they were so good "I bought the company" ! They are very nice. The get used up quickly but they are nice and reliable, and write smoothly. Barrel a little thin but they are very good.

This review applies to the UM-151S red gel-grip rollerballs, as there seems to be a mush-mash of options covered by the same review process.The gel grip gives more purchases than a cheap shiny plastic body, I like the feel of these pens in my hand as they are well balanced.The cap has a *very* firm click as it locks into place, so is unlikely to fall off or get lost in a bag or whatever.The pigment gel ink and stainless steel tip combination works well to produce a consistent and non-scratchy flow when writing.I usually prefer a finer nib/tip/ball to be honest, but as you can see from my attached photo the 0.7mm one of these pens isn't exactly thick or clumsy. I couldn't find any 0.5mm tip red pens that matched these for value, so here we are.Great value, and this box of 12 will almost certainly see me through until this time next year I reckon. Shame I can't find a red Parker 'quink' rollerball refill though, as I'd rather keep a single pen and just refill rather than buy disposables - but hey ho...

Bought for our wedding guestbook after reading good reviews, very happy and I've started using one from the pack for work as they are really good pens

A very good product, used for my crossword hobby