This item was received from an acquaintance. I am not familiar with musical instruments, so I do not know the details. A friend who can handle instruments has taken care of it. There is some sticking on the main tuning slide. There is no sticking on the 1st, 2nd, and 3rd slides. However, the 2nd slide is stiff. The pistons move smoothly! The screw under the piston (2nd) is stuck. Valve oil is included, but there is only a little left.