I have UC-12B 12mm in my other listings.

This package includes 100 pieces of Ultra Clean Technologies UC-16BE projectiles in UC style 16mm. Recommended Use for 3/8" (10mm ID hoses

Functionality: They remove fine particles of loose contamination and can be used for product purging. They work by being compressed against the internal surface of the line; they are typically sized 20% to 30% larger than the internal diameter of the hose or pipe to ensure effective cleaning pressure. For effective cleaning, a projectile should be approximately 20% to 30% larger than the internal diameter (ID) of the line to ensure it compresses against the internal surface.

According to the manufacturer's sizing charts, the 16mm UC16 is typically recommended for:

Hose (ID): 3/8" (10mm).

Hose Assemblies: Dash -8 for JIC and FFORX fittings. Tubes: 12mm x 1.0mm or 12mm x 1.5mm tubing. Pipe: 3/8" Schedule 80 pipe.