– Low speed is now up to 1500 rpm, high speed is up to 4700 rpm (approximate values​​, was 1100/2500)).
– The small pulley has a 9 mm bore with 3 mm keyway. The large pulley has a 30 mm bore with a 5 mm keyway.
– Super precision aluminium pulleys.
– Special Polyurethane 60 degree V belt for small pulleys. Minimum flection resistance, minimum power loss, maximum belt life. Polyurethane 60 degree V belts (Mitsubishi) performs appropriate and best results for small size pulleys.
– More lightweight and aesthetic, higher durability.
– Wide sliding mechanism for a easy belt change.
– Practical automatic locking mechanism for the work spindle.
– Belt cover can be replaced quickly.
– Easy installation in a short time. Moreover, without making permanent changes to machine. via https://www.mbbilici.com/

Well, I chose to remove the plastic gears and axle with bearings, gear shifter etc 😉
Communication and shipping were excellent, needed a little wiggling to get the pulleys on the same height on my X2P, overall super satisfied, highly recommended.