A company manufactures tennis balls. Classify each of the following costs as either direct materials, direct labor, or factory overhead.

$\backslash$table$[[1.$ Indirect materials used in making goods.,$],[2.$ Cans to package the balls.,$],[3.$ Depreciation on factory equipment.,$],[4.$ Wages paid to assembly workers.,$],[5.$ Factory rent.,$],[6.$ Factory manager's salary.,$]]$