Oh my they are cute!
You just gave me a flashback. My Muddy and Koko were orphaned at 10 days old. They were from a litter of 4: 2 gingers and 2 blacks. They were the size of yours when I brought them into my home to start feeding them. On day 11, 3 of them opened their eyes and the last one opened her eyes on day 12. I remember being able to pick all 4 of them up in one hand. I also remember that by day 13 they all got really squirmy and by day 14 it became really hard to keep them clean.
They grow so fast at this age. Enjoy it while you can and take a lot of pictures!!
p.s. Scarlett in my siggie is a ginger female. No, you can't have her.