ConairVelvet Touch Vent Brush - 1 Brush

What is the total diameter including the nylon bristles? Is this the small version (77202z)?

I just received this item and it is gold and blue not silver and black like the picture shows! why?

What's the diameter of the core, not including the nylon bristles ?

Under features & details of this vent brush tells me its a printer too and I can search the web. I'm not a genius but I think something is very wrong here...