These are small handheld sparklers (≈ 4 inches) that produce coloured sparks (rather than just silver/white) when burned. They often combine standard sparkler formulations with metal salts or dye additives to yield red, green, blue, etc. sparkles.CrackersIndia lists “10 cm Colour Sparklers” (10 pcs/box), with a burn time ~10 seconds.Butterfly Crackers says their 10 cm colour sparklers last about 10 seconds, with a safe distance of ≥1 m, and give crackling + coloured “electric stars.”Use outdoors when possible, or in a well-ventilated open space. Keep distance: hold at arm’s length, keep at least 1 m or more from yourself, others, flammables. One at a time: light only one per hand; don’t hold multiple together. Protect surroundings: ensure no flammable surfaces (cloth, dry leaves) are close. Dispose properly: once a sparkler burns out, the remaining metal wire/stem will stay hot. Douse in water or sand before discarding. Don’t try to relight a dud (one that didn’t ignite fully). Wait for it to cool and discard. Storage: keep unused sparklers in their sealed box, dry, cool, away from open flames or heat sources. Check certification & compliance: buy from reputable sellers who list safety / regulatory compliance, especially in places (like India) with strict firework laws. Supervision: Always supervise children using sparklers.