Question about Philips 5000 series BHA530

This applies to all parts.

I don't know exactly, my wife bought the brush years ago and only used it a little. I think the weight refers to all parts together, the brush itself is mostly made of plastic.

Without any accessories, the weight is 350g.
The rectangular brush (mounted on the hairdryer in the photo) weighs around 80g on its own, and the other accessories weigh about the same.