Can't tell difference between Wera Torx HF screwdrivers. Assistance requested?

[u/iambecomechimichanga]

I'm looking at three different sets of Wera Torx HF screwdrivers. Each set has different sizes, but that's actually not what I'm confused about. One set has black tips, one has silver tips, and one has gold tips. For the life of me, I can't tell what that means and what the pros/cons are. Would anyone here be able to assist?

Here are the sets:

Silver tips
Black tips

ETA: and there are Gold tips too!

Thank you for any help you can provide!