1.Brief Introduction Key advantages of Magnetic wire tensioners: These magnetic tensioners use a device containing a permanent magnet as a noncontact method of generating a variable resistance to rotation of the main wheel of the tensioner, thus maintainingwire tension at the set value for longer periods than their mechanical counterparts with greatlyreduced requirement for adjustment. Polished ceramic eyelets and guide rollers at each point of contact protect the insulating enamel from mechanical damage. The performance of these magnetic wire tensioners is exceptional given the low cost, providing outstanding value for money. Captive roller on tension arm is easy to thread, eliminates chance of losing wire.