Some people prefer to use dice with rounded corners, for the sake of comfort and ease of use. Personally, I favor a more Darwinian approach. Behold the Morningstar dice, guaranteed to strike fear into the hearts of your opponents, teammates, DM, and whoever owns the table you're playing on.
Always remember to treat these dice with the appropriate respect and caution. And by respect, I mean put a mat on the table. And by caution, I mean wear shoes. (You thought stepping on a lego was bad? Buckle up, buddy.)
Keep out of reach of children, pets, and stupid people.
Others in this set:
D4
D6
D8
D10 (ones)
D10 (ones, alternate)
D10 (tens)
D12
D12 (rhombic)
D20
D20 Spindown
Basic set