Strengthen your hands-on lab exercises on the Laws of Resistance with this handy set of eight all-purpose labeled resistance coils. Students can use them to test how resistance is affected by type, length and diameter of the wire used. The math is easy, and the results very predictable. Each coil is clearly labeled with wire length, gauge and material composition and has two convenient soldered terminals for easy connection to your measuring devices. Comes complete with instructions, answers and a plastic compartmentalized storage container.