Airsoft Atlanta is not based in California, but in this video they explain that for their customers in California, they will have to comply with SB199... "We legally ship airsoft guns to California as of Jan. 1st, 2016. All other states*, we ship without this tape. Tape is only for California customers.
The tape is a proprietary blend of cloth and permanent adhesives in a fluorescent blue, per legal CA laws. It is comfortable to the grip, not like duct tape, electrical, or other cheap tapes. We use an expensive blend for maximum safety and comfort for pro-players and collectors."