Turtles from the Flea Market

Those are Red-Eared Sliders. At this age they're too young to sex but be prepared because the females grow quite large.

Here's a great care sheet on this species.

http://www.austinsturtlepage.com/Care/caresheet-red_ear_slider.htm

Check state laws, some states don't allow ownership of redears.

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They are Red Ear Sliders as everyone stated. That link posted above is a great site for care sheet. They are to young to determine their sex as mentioned as well. You won't know their sec till they are bigger, makes have longer nails and tails and females have short nails and tails. As a expense view you'll want males because they do not require as big of a tank, also sometimes females will not like to be housed together because they'll attack. I own 3 RES that are all females, two are able to live with each other, one can because she attacks them. Look at that care sheet site, it'll give you every information needed. If you need help PM me, as I said I own 3 of those turtles and a painted turtle.

Side note, if you do a substrate do either big river rocks or sand, small gravel they can try and eat and will get stuck in them and eventually kills them.

Give them more space to live, they are soooooo cute.

I was in the same situation, got a red eared slider at a flea market 14 years ago. The Austin's Turtle page is probably the best comprehensive care sheet out there, and I would give it a read. Red Eared sliders are not a beginners turtle, but they are often sold that way. I had mine in a small plastic container too, I was too young to know better when I got it, but get them out as fast as possible. I have a single male in a 60 gallon tank and honestly it could still be larger. For 2 turtles, without exaggeration, a 125 gallon tank will be needed eventually. For the time being I would suggest getting AT LEAST a 20 gallon long tank, that'll last you a few months. To save on costs, it'd be better to buy everything used off of craigslist. The turtles are pretty tough, but they do get quite large.

Being in Hawaii, if you have a yard, a small outdoor enclosure with a pond would be perfect!

Good morning from CA,
I just bought 2 for my son from a flea market as well. We don't know the sex or what kind they are. We got a little carrier and food for them when we bought them. I sure do want to have the right things for them as I do my horse and cat. This is so frustrating. Can anyone please help me and give me some feed back???

The link from Vicious Fish should help, and posting pictures will allow members to help identify the species if you can't. Red ears are the most common, but keep in mind they are invasive in California.