To help you:
Blog article ‘La pleine-conscience et le bol de cristal' ‘(Mindfulness and the crystal bowl') https://www.cristalvibrasons.com/fr/articles-conseils/psycho-meditation/la-pleine-conscience-et-le-bol-de-cristal (in French)
YouTube: La chaine des bols de cristal (‘The crystal bowls channel'): https://www.youtube.com/channel/UCZCXDhOB-6xzCxUScxLH26wUScxLH26w (in French)