A professional grade blend of portland cement, sand and gravel that is formulated to reach strength quicker and for superior durability. For repair and building jobs where concrete thickness exceeds 2 inches. This is 25% stronger than standard concrete mix-5000 psi vs. 4000 psi. Comes on a returnable pallet, so if you order 15 bags or more at one time we might need to add a pallet charge, which is fully refundable upon return of the empty pallet. We'll be sure to contact you if we need to do so.