Key pen for oud and violin provided by Pirastro company Pirastro Peg Compound

The key compound is a substance applied to the key to facilitate its movement in case the key makes sounds or is difficult to turn. It works to lubricate the key to become more flexible and smooth during turning inside the lock. In addition, the compound treats slippery or loose keys, making them more controlled and firm. A magical remedy for slippery and stiff keys. Made in Germany.