【Product Description】 100% Synthetic ▽How to Oil▽ Remove the cap screw of the valve casing and slowly pull the piston out straight, about halfway. In this state, apply 2-3 drops of piston valve oil. Then, tighten the cap screw again and move the piston up and down 2-3 times to allow the oil to settle. ▽About Maintenance▽ It is best to use the same type of valve oil from the time you clean the instrument until the next time you clean it. Therefore, when changing the type of valve oil, remove the old oil from the piston and valve casing by washing or wiping it off. This will allow the new oil to perform at its best. ※The appearance may differ slightly from the image depending on the production lot, but the parts are exactly the same. Keywords: Practice For Trumpet Trumpet Set Case Mouthpiece Beginner Set Piston Valve For Practice Wind Instrument Present Birthday Children Beginner Accessories High-Class Gorgeous Overseas Brass Wind Brass Instrument Oil Maintenance Convenient