A fun necklace activity where kids can make one for themselves and the other for their best friend! Simply slide the beads onto the rubber necklace cord and clip on the rubber charms. The rubber charms are also designed so they can fit together to make a Peanut Butter & Jelly sandwich necklace. Bff Necklace Activity. Includes 2 rubber charms, 2 rubber cords and 32 beads. Designed for use by children ages 4 and up.