Razor Wire

Razor Wire is a transparent, semi-tangible block added by Immersive Engineering. When an entity or player touches or penetrates the block it will receive a slowness effect for the duration of contact with the wire, as well as taking damage. Razor wire can be electrified by connecting it to a low-voltage power source via an LV Wire Coil, which will slightly increase the damage output of the block. Powering it with a redstone signal will make the "spikes" disappear, which could possibly stop the block from dealing damage [research required]

Crafting
Razor Wire has no known uses in crafting.