Even AT-ML150 cantilever is Gold Plated too, but it’s not Boron, it’s Gold Plated Beryllium. Here is a picture of my ex AT-ML150. So i just don’t know anything about your 160 model (can be beryllium or boron). But the next model in official Japanese catalog is AT-ML170 with different cantilever and different style of mounting stylus tip on this hollow boron cantilever: https://scontent-amt2-1.xx.fbcdn.net/v/t1.0-9/20139640_1791997270818432_584247051679766313_n.jpg?oh=...
Why the AT-ML180 stylus/cantilever is different?
The stylus is 0.08mm (for others it's 0.1 mm). Vertical tracking angle is 23 degree (for others it’s 20 degree).