Safe indoors and outdoors! Also known as "cold sparks," this amazing effect ignites at a COLD 60- degrees. AMAZING for grand entrances, first dance, and fun energy on the dance floor! We use safe professional grade spark machines. (No cheap, mis-firing knock-offs.) Sparks can run for about 10 minutes total, 30 seconds at a time. Available venue-permitting. Yes, they're worth it!