Anyone know the difference between these two diamond dremel discs?

[cjchaps]

On this auction, you only get one for around $8.00

On this auction, you get 10 discs for around $8.00

So, is the one for $8 better quality than the other 10 discs for $8, or do you think they are similar quality?

I plan on using these for lapidary purposes. Like cutting open or polishing small rocks.

 

[alkemyst]

Not going to do too much polishing with them, they break easy if lateral pressure is given.

The one auction is a genuine dremel disc, they also make a cheaper one like the second auction. Off brand discs are hit or miss...however dremel makes the standard cut-off disc in a tube pretty cheap.