The ashes of 152 deceased were onboard the third ever launch of a Falcon Heavy rocket.
SpaceX doesn’t deal with the family members directly; a company called Celestis Memorial Spaceflights coordinates the launch. It can cost $5,000 for one gram of human ashes and families can choose from between 1-7 grams.
The ashes are loaded into capsules and each capsule can have words etched into the sides, akin to what might be on a tombstone. The 1g capsules look like large watch batteries and the 7g capsules look like a metal tube, or maybe a standardized weight from high school science class. The capsules are loaded into a metal sleeve and, on this flight, are on the same spacecraft as NASA’s atomic clock (the new atomic clock will allow for space navigation without relying on timekeeping from earth).