I still use the same helmet I bought ages ago. I seem to remember it being a Bell, but I couldn't begin to guess the model or even tell you how old it is. It's plain white (now yellowed) plastic about 3mm thick (5 at the rim) and has 8 vent holes in, in overall shape as near half-a-globe as is consistent with fitting a human skull. The ANSI Z90.4 polystyrene liner was glued in, but is now loose. The only possible identifier is a Kajima Chemical Company sticker on the inside. It has a serial number, if that would help identify it.