There are several items that are essential when putting together a save-a-dive kit, cylinder valve O-rings, fin straps, buckles, etc. One of the most important items is the spare regulator mouthpiece. XS Scuba Dual-Color Silicone Mouthpiece should be one of those items. Good looks and good comfort. Two material, liquid silicone injection FDA approved material. Includes traditional mouthpiece tie wrap. Available in multiple colors.