Length: ~30 cm (≈ 12 inches)

Colour effect: bright green sparks / stars (often made using metal salts or special formulations)

Burn time: many manufacturers list ~30 seconds for 30 cm green sparklers. For example, Butterfly Crackers lists duration = 30 secondsSafety & Handling Tips for 30 cm Green Sparklers Because these are relatively large sparklers with stronger effects: Hold at the base / handle — ensure your hand is far enough from the burning portion. Maintain safe distance — spectators should stay well back (2–4 meters or more depending on environment). Use outdoors or in well-ventilated open space — avoid enclosed or flammable surroundings. Light only one at a time — don’t try to ignite multiple together. After burning, cool before disposing — place spent wires in water or on heatproof surfaces until fully cool. Check for certification / compliance — ensure the product is approved under local fireworks regulations (PESO, etc.). Supervise usage — for events involving children or large crowds, ensure trained / responsible adults handle the sparklers. Avoid overhead hazards — no drapes, cloth, branches, etc., in the path of sparks.