zebra bar?

there's a boy at sophia's school who is not, according to sophia, her friend, because he is not "cheerceful". but she still gives him a hug when she leaves. in fact, she gives everyone a hug when she leaves, especially when she stays for a full day as she did today, and which normally happens about once a month. she'd probably prefer it happen more. anyway, today she needed to give everyone his/her hug before leaving. imani wasn't all that interested in stopping what he was doing to embrace her,
but she said "hey, you", actually more of a yell, and then "come here" in the imperative, with her arm out, and her fingers beckoning him. not an invitation or a suggestion but a command. he dutifully obeyed and she got her final hug. for snacks they had zebra bars, she told me, which are kinda a big but a little small but not very much small, but kinda big but small too and medium big. what the bloodclat is a zebra bar and exactly what size is it?