Price included set of BrakeTech ventilated caliper racing piston and Honda caliper piston oil seals.
 
These BrakeTech ventilated caliper racing pistons replace the aluminum OE pistons that are highly conductive in providing a huge heat path into the hydraulics.   BrakeTech is now addressing this with specially engineered ventilated stainless steel pistons of proprietary material that all but eliminates those shortcoming.
 
Key Features:
Reducing thermal conductivity by 94%
Dramatically improves piston retraction, reduces brake drag
Increases top speed
Improves release time for greater control exiting the apex
Improves overall braking consistency under severe racing condition
Unique Fluid Maximizer creates a strategic chamber that increases total fluid volume to further retard thermal build
Patent Pending
Made in USA
 
Fits:  
Nissin dual piston front brake caliper in following years and models:
01-18 CRF250/450
02-23 KX250/450
08+ RM250/450