What is the card size of Dust cards? Which card protectors will fit?

You really don't need card protectors for these, they are very sturdy, coated cards.

But still... Can anyone tell me size? Thank you!

They are not card sized. They are about 3"x4.5" and are made to use dry erase markers. They don't make sleeves that large.

6" x 4" photo protectors fit, you can ebay them.

I picked up some ~4"x6" card protectors at my FLGS. Not sure what they are designed for, but they will do a great job of protecting the cards from random wear & tear.

Gobbo is totally right, but you can get real strong ones from Bags Unlimited in the photo section.

These are the ones I use: Ultra Pro 4x6. I use them because while the cards are sturdy, mishaps may occur; cheap insurance keeping everything nice.

www.amazon.com/gp/product/B000O9QJP2/ref=oh_o00_s00_i01_details

Cheers!