1-10 Dice Block
From the Super Mario Wiki
A 1-10 Dice Block is a special Dice Block that appears in Mario Party 9. As the name suggests, it is a Dice Block that rolls 1-10, just like the Dice Blocks from the previous installments. 1-10 Dice Blocks are more rare than the other three, only being obtained very rarely when landing on a Dice Space, as well as when landing on a Spin Space.
The 1-10 Dice Block is shaped like a pentagonal trapezohedron instead of a cube like the other dice blocks. This is the same shape as an actual 10-sided die.