These are replacement flares for the #528 Pocket Rocket, designed as a small boat or PWC aerial signal.
See Related Products, below.

Average burn time: 6.5 seconds each
Altitude: up to 300 feet
Average brightness: 10,000 candela
Note: These items can be shipped within the US by ground via common carrier (truck), but will incur a $35 (6/24/13) hazmat handling fee if shipped via UPS or FedEx; CANNOT be shipped by air, nor via USPS