Arrowstone Free Flow Single Use Bags contain 2 lbs of casting material packaged in a heavy duty plastic resealable pouch. Just add ≈6.5oz of water to pouch, knead to mix, and within minutes you’re ready to pour. This fine granulated stone requires minimal kneading. Arrowstone Free Flow is perfect for all weather conditions. The ”tap test”, or set-up time, is half of most common casting stone.