Thanks to an innovative, patented design, the reel does not use rotating rings with brush rub or mercury contacts. Therefore, all the problems associated with the rotary contacts have been eliminated, including faulty contact during rotation as well as maintenance and replacement of the contacts. 3 springs are used for rewinding the cable double as wires for the three electric signals. The reel's thickness is just 4.8cm, slightly more than the piste's height. The diameter of the cable coil is 31cm. Therefore the reel can wind the 20-meter cable in just 20 turns. By contrast, currently available reels require 40 to 50 turns. Longer-lasting high-quality steel springs. Stainless steel flat case that weighs 4.8kg-it does NOT pull with the fencer.