This is a long axle version, rated to run at 40000 rpm.
The latest high-performance motors in the ULTIMATE Upgrade Series are made with CNC machined parts for greater strength and performance, and have all been developed to include the latest technologically developments, in a continuing effort to offer a wider selection of motors allowing the discerning Airsoft player to find the optimal solution for any particular upgrade.
For in-depth information on the INFINITY CNC series, see datasheet here.
  
Features:

• CNC machined aluminum front and back covers
• CNC machined pinion steel gear
• CNC machined stainless steel shaft
• Silicon steel rotor
• Precision built motor housing
• Heat resistant rare-earth magnets
• Enlarged motor-shaft ball-bearing stabilizers
• High-grade silver plated wiring and larger carbon brushes for improved electrical conductivity

  
The INFINITY CNC motors are designed, with the best features found in Airsoft motors currently on the marked. The result is a motor which is at the pinnacle of what is achievable today.
The INIFINITY CNC is the best of the best.