The students used: fine motor skills, (especially important for the developing writing muscles) patterning and counting skills, and social skills! (sharing and negotiating).
I plan to keep these ready to go until the end of the year. Then I'll let each child make a necklace to take home.
Tip: I dip the ends of the yarn in melted wax. This helps keep the yarn from tangling and makes threading the beads easier because the yarn doesn't unravel. I usually dip a big supply during the summer for all yarn needs that come up.
You can also use pipe cleaners (chenille rods) to make bracelets.