I understand that that is a really simple question and connecting in series is quite simple as well (I'm aware of how to do it for other materials), but piezoelectric crystals have absolutely stumped me. I have with me piezoelectric ceramics that are golden on the top and bottom and clear in the middle. I would sincerely appreciate it if someone could guide me through connecting them in series, i.e what to connect with (more likely insulated wire?), and more importantly where.

Thank you!