These are the new Unicorn Hero 95% 27 grm darts I've been trying for the last few weeks. They're waiting in the wings in case I lose my Harrows Magnum 27grm, which are no longer manufactured.
I accidentally selected the "Latinum" option when I ordered them. It's hard to find out exactly what Latinum actually means, but one site described it as "New Unicorn Latinum Tungsten Technology Gives Smooth Release & Soft Feel".
"Smooth release and soft feel" is a bit of an understatement! They always felt greasy and wet, and I couldn't actually grip them properly. It's like a fine satin finish, and really hard to explain until you actually hold them. Anyway, to counter this I've taken a metal file to them and roughened them up a bit. You can see the effect in the picture. This makes all the difference, and I can throw them quite well. Also, I took 3mm off the points to make them exactly 2.5cm in length, which is the length on all of my favourite sets (Hi-Tec, Alan Glazier Shark, Magnum).
You'd be wise to avoid the Latinum finish unless you really need this silky smooth finish on your darts, but apart from this I'm quite pleased with them. They are individually laser etched with "26.9g", so I didn't file that bit :o)