Halfway Dice Block
From the Super Mario Wiki
A Halfway Dice Block is an item that is purchasable in the Item Shop of Mario Party DS. As its name suggests, this item has a maximum dice roll of 5, half of numbers of a normal Dice Block, which goes up to 10. Also, in Kamek's Library, when the player lands on a ? Space at the very top of the board, Kamek would appear and replace the player's items with three Halfway Dice Blocks. It only costs one coin.