- Battery Holder Single (D Type): Designed to illustrate both series and parallel circuits. Made of high impact plastic. Holds standard "D" size battery. Each unit has male and female button connections to connect as many as required without using leads. Extensions on sides also allows easy wire connections.
- Battery Holder Flying Leads, 2 X AAA Type size battery holder manufactured from black polypropylene and high quality metal components to ensure a secure and reliable connection.