You can find information about how the product is delivered on the product page in the store. If supplied as bulbs, the size will say 10/12 cm, this means that the bulbs are 10 - 12 cm in circumference.
Flowerbulbs are measured in centimeters all over the world. One cm is about 0.4 ".
If it is supplied as a rhizome, tuber, tuber or root-like root we call it a bare root plant.