These motors were warranty replacements for a previous purchase. I bought several 29mm BP motors for my Estes So Long. On its last flight the booster motor failed to light the E16-8 and that caused substantial damage to the rocket. Further inspection revealed that both motors in that package had clay blocking the path to the black powder.
Estes has always made good on warranty replacements, and I now have replacements for the rocket and both E16-0’s and E16-8,s