Sparklers burn at 2,000 degrees - hot enough to melt some metals. The Melbourne Fire Department recommends following these sparkler safety tips from the American Pyrotechnics Association:

• Always have an adult supervise children using sparklers. 
• Only use sparklers outside.
• Never light or hold more than one sparkler at a time.
• Always keep sparklers at arm's length away from the body. Stand at least 6 feet away from other people.
• Don't run with, throw or hand a lit sparkler to someone else.
• Avoid loose-fitting apparel (sparklers can ignite fabric).
• Wear closed-toe shoes.
• Douse spent sparklers in a bucket of water.