Tenn. Code § 68-104-110
Permissible items of fireworks, as provided for in § 68-104-108, may be sold by a retailer or a seasonal retailer, except that fireworks does not include toy pistols, toy canes, toy guns, or other devices in which paper caps containing twenty-five one-hundredths (0.25) grains or less of explosive compounds are used; provided, they are so constructed that the hand cannot come in contact with the cap when in place for exploding, and toy paper pistol caps which contain less than twenty-five one-hundredths (0.25) grains of explosive compounds, cone, bottle, tube, and other type serpentine pop-off novelties, model rockets, wire sparklers containing not over one hundred (100) grams of composition per item (sparklers containing any chlorate or perchlorate salts may not exceed five (5) grams of composition per item), emergency flares, matches, trick matches and cigarette loads, the sale and use of which shall be permitted at all times.
T.C.A. § 68-104-110