X-Bandz set of 1 - 12 multiplication glow in the dark learning bands X-Bandz is proven successful in learning multiplication facts. X-Bandz will Increase a students confidence and self-esteem in Math. X-Bandz is a great tool for teaching all kids including special needs children. X-Bandz the smart fun learning tool that doubles as a charm band. X-Bandz is guaranteed to succeed! 30 days.