Contents: 30ml This is an odorless, non-sticky cutting oil. It prevents wear on the cutting edge of a glass cutter and further smooths the cutting action. While some people put cutting oil directly into the cutter body for self-supply, there's a risk of oil leakage if the packing is crushed. Therefore, we recommend soaking a sponge, cotton, or cloth in oil and placing it in an empty bottle with a lid. Then, apply the oil to the cutter tip each time you cut.