TrYptiX Men's LED Black Framed Steampunk Gas Mask Adjustable elastic band, one size fits most! Super bright LED's with multiple modes Removeable and replaceable cartridges 7 Unique modes (Alternating, back and forth, blinking, and rotating) WARNING: THIS IS A NOVELTY ITEM ONLY. DO NOT USE IN PLACE OF A REAL GAS MASK. This product will not protect you against harmful gasses.