This motor is a short axle, low speed/ high torque motor (LS/HT). Suited for between M130 and M210 springs, with appropriate gears. The new high-performance motors in the ULTIMATE® Upgrade Series all have hand-coiled and equalised rotors that ensures optimal performance. The motors build on the latest patented technology, requiring less maintenance, longer life span and not least higher performance – abilities vital to the professional gamer and the conscientious Airsoft enthusiast. Features: Anti oil-absorbing function Motor stabilizer Superior Heat emission Polymer back cover Unsurpassed Durability Internal ball bearing support. Super Magnets for repeated and perfect performance. Oversize carbon brushes for long life performance. Steel pinion gear hardened to 50-55 HRC Multiple stress tests shows that INFINITY high performance motors ranks second to none.