This is a strap, keyholder, or charm.
Three sweet heroines from "Little Busters! Ecstasy" are featured in this set of a plastic strap and a metal dangle of each character: Saya Tokido, Sasami Sasasegawa, and Kanata Futaki. Pick the metal dangle(s) of your favorite girl(s) to add to the plastic strap and then attach it to your mobile phone to accompany you wherever you go!
Also check out the other set, linked below, with three more girls to add to your company!