a number of blackberries

A short stem is still fastened to the berries, breaking of the smooth, round surface. The berries are dark in colour and they look very tasty indeed.

They are a number of blackberries.
They weigh about an ounce.

You identify a number of blackberries.
They are food.
They weigh one ounce, and they are worth about twelve busc.
Their keywords are blackberries and berries.