Look for pistons with Molybdenum (Moly) or Dry Film Lubricant on the skirts. These reduce friction and prevent "scuffing" during the critical break-in period.
The catalog for FIM pistons primarily covers "Piston Kits" (seher set) categorized by engine model and pin diameter. Below is a breakdown of common FIM piston series and their technical specifications: katalog piston fim
Below is a simulated breakdown based on actual market data for Southeast Asian and Latin American markets. (Always verify with a real FIM printed catalog for your specific engine year). Look for pistons with Molybdenum (Moly) or Dry