This oiler comes filled with clear sewing machine oil and has a thin brass tube and cap that screws in place. The tube end dispenses a drop of oil at a time and is thin enough to get into tight spots. The extendable spout means it can get from the top of an oil hole to the mechanism that needs the oil. This oiler can be refilled. Be sure to always use clear, good quality sewing machine oil and follow the instructions in your sewing machine manual for maintenance of your machine. Never use this type of oil in a sewing machine motor, which requires a special grease.