Called Pixy Stix, I remember these as being called Lik-M-Aid. Kind of like powdered 'sweet tarts' in a little straw. You bit off the end and poured the powder onto your tongue (which became brightly colored depending on your flavor!). You had to be careful eating these because if you ate them too quickly you might inhale the powder and choke! Probably why they make 'SweeTarts' now, in chewable form.