The most popular types of fence insulators are:
Ring insulators
Ring insulators are cheap and easy to use, they are compatible with wire, polywire or thinner tapes. They come in several variations including screw on, bolt on and offset.
Tape insulators
As the name suggests, tape insulators have a wider design are are intended for use with electric fence tapes.
Pigtail insulators
Can be used with rope, wire and tape. The simple design is durable and easily allows the fence to be held at a distance away from fence posts or other foliage.