Includes 2 coils: inner and outer coils, should be able to demonstrate both step up and step down transformer operation. Outer coil: 2 3/4" dia. x 4 1/2" tall. Inner coil: 1 1/4 dia. x 3 3/4" tall.

All coils wrapped with 20 gauge magnet wire with insulated binding posts as connectors, yellow color.

Removable steel core 1/2" dia. x 5 1/2" tall, excluding handle. Instruction and lab manuals included in English.