4″x4″, 4″x8″, 4″x12″, 8″x8″, 8″x12″, 12″x12″, and 12″x16″ stone sizes. Corners come in 4″, 8″, and 12″ heights with 4″, and 8″ lengths. Average thickness is 1.125″ and are sized for a 1/2″ mortar joint.