Thousands of visitors at Memorial Park in Colorado Springs ended their Independence Day Holiday by watching a spectacular display of fireworks.

But before on-lookers got the chance to view the show, Pyrotechnists worked all day to make sure the show went off with-out a hitch.

The pros showed 11 News how time consuming and labor intensive it is to build fireworks. But the end result, they say, is dazzling.

The Pyrotechnists also said that they're happy thousands of people chose to see a show instead of putting on their own and risking lives.

Friday's show consisted of more than 1,000 firework pieces being blasted into the air. The colors according to many were breathtaking.

"Fireworks!" said Sam Webb, a patron at Friday's fireworks show.

Many describing the sounds as wild. "Bang! And then the big loud poof comes out!" said Tim Schlueter, a patron at Friday's fireworks show.

It took several Pyrotechnists and more than 10 hours of straight work to build their fireworks from scratch. But they say they like what they do, and make sure their hard work doesn't foil in the end.

"If something goes wrong someone is going to get killed," said Randy Jensen, Owner of Fireworks Extraordinaire.

The Pyrotechnists say they construct each piece carefully, or else. "It could go off," said Karen Schelm, a Pyrotechnist

Bulbs ranging from the size of an orange to the size of a football are then gently placed into large black tubes called mortars. "We have to put our lives in each other's hands," said Jensen.

There is also a ton of wiring, coils and coils of it. The wires are filled with fuses that can burn 60-feet per second. So the fireworks are not ignited with an actual match, but with a switch from about 100 feet away.

The end result? "The big boom," said Webb. A magnificent array of sparkle is then splattered 500-feet into the air. It's a treat for its creators who not only get to see them, but feel them. "Vibration flowing through your body. You feel the ground shaking," said Schelm.

The only way the Pyrotechnists say they know their job is done has nothing to do with how wild the crowd goes. "We listen to how many car alarms we set off!" said Schelm.

The only weather condition that'll shut down a fireworks show is wind between 15 and 20 miles-per-hour.