When you play a brass instrument you must ensure your valves are lubricated. To do this you need to oil the valves regularly. Take a look at this 'how to' and you'll find out How To - Oil A French Horn Rotary Valve. https://www.youtube.com/watch?v=urbi-caNVKI&feature=youtu.be If you have any queries please don't hesitate to contact us via our Repairs page. Or call the sales team on: 01283 535333 or email: email@example.com and they will be happy to help too. Check out more of our How to video's here.