Hi folks; there's not much to say about it, apart for the horrible taken photos... 2 diferent kind of helmets one bicycle ligth bought from a bicycle store. it's own elastic strap for the black & white helmet and elastic cord on the yellow one in order to get through the longest space of air holes. and few plastic straps. on the yellow helmet I put also some velcro between ligth-helmet, that it doesn't slip. that's it.