What kind of weights are these?

Hi folks,

Someone posted this video last night, and I was wondering if anyone knew what kind of weights she's using in the video? They look really easy to hold. If not these particular ones, do you know of any similar ones?

http://www.fitnessblender.com/v/workout-detail/Kelli-s-Booty-Workout-Ultimate-Butt-and-Thigh-Workout-for-a-Round-Lifted-Butt/gm/

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