Brushless confusion

[Southwell]

Right, so looking at the L series Novaks i see it says their sintered, but also offer another sintered rotor???

Just like the original Velociti motors, the Velociti Light motors are also equipped with the exclusively designed Nickel-plated Sintered Neodymium rotor. This high-performance rotor provides many of the same benefits, including increased magnetic strength, stronger motor braking power and maximum performance in higher temperature conditions. The 13MM Sintered Tuning Rotor is also compatible with the Velociti Light motors and can be purchased separately as an accessory item (#5909).