As far as I know Draper are the only company making the decent type of strippers, where they work more like pliers than a gun. they feed in from the side and have pre set holes for the cross sectional area of the cable, where as the gun type feed in from the front and you have to wind a screw to set the csa and its not very accurate.

Draper Wire Strippers

Should be the top set for small wire, with green handles, and theres a red set for slightly larger wire.