The Diamond® Air is an innovative wall block with a locator system that creates a near-vertical wall. This system fits any retaining wall application and increases installation speed with its lightweight design. Smooth face block pallet contains 48 units. A corner pallet contains 24 units. The colour Hickory is special order. Straight face block pallet contains 48 units. A corner pallet contains 24 units. The colour hickory is special order. Please allow for a delay of 7-10 business days for the order to be processed and delivered to you. Special order items may take longer than a month.