The OX Pro Grout Bag with Metal Reinforcing Tip is made from heavy-duty canvas with a heat sealed seam. The bag can handle the toughest jobs and is resistant to punctures and tears. The metal reinforcing tip ensures the bag stays in shape and doesn't collapse under pressure, allowing for a smooth and efficient flow of grout. The OX Tools Pro Grout Bag has a capacity of 12 liters, making it perfect for both small and large jobs.