+1 thermalite slow (pink wrap)
Thermalite medium burn (green wrap)
Thermalite fast (white wrap)
Slow is best for igniting motors, used to be set with flash bulbs alot back in the day but it is great for clusters and air starts with an e-match to start it
Thermalite. The wires are iron. remove 3 or 4 leaving 1 or 2, wrap lead wires around the stick. Gets so crumbly the pyrogen falls off after a few years in the magazine.
Regulated, need ATF license. Use more for larger motor (about 6" for a L750). What you see is for 29 mm motors.