Pirastro Gold Rosin

I find with most rosin, it ends up breaking into little bits, how it's held together is important. I like the packaging of this one, the cloth holding the actual rosin. Much better than the older red tin, which had a tendency to get stuck over time (the only way to open the tin was putting it into hot water!)
A good reliable brand, and for the price well worth it.

Good rosin, full grip on the strings

Love this rosin. It comes with a cloth attached underneath and wrapped around. Very neat design. Plays well. So far it has not broken, which is a problem I got with a cheap rosin. Price is reasonable.
The only drawback I can see is it comes in a cardboard box, not an issue if your playing at home but would need careful packaging if you are transporting your cello to college or recitals etc.