The ISU Grand Prix of Figure Skating Series started in 1995 (previously known as the “ISU Champions Series”) and consists of six international senior events that culminate with the ISU Grand Prix of Figure Skating Final. The Skaters are seeded and invited to the six Grand Prix of Figure Skating events based on the results achieved at the previous ISU World Figure Skating Championships.
https://www.isu.org/figure-skating/events/grand-prix-of-figure-skating