The Diamond Pro® Air is an innovative lightweight wall block that’s 30% lighter for efficiencies on every level. Smooth - quantity per pallet: Wall: 40 units. Corner: 24 units. Cap: 54 units. Straight - quantity per pallet: Wall: 40 units. Corner: 40 units. Cap: 56 units. Quarried - quantity per pallet: Wall: 40 units. Corner: 30 units. Cap: 54 units. The colours Iron Bay and Newport Grey are 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.