This Supertech sodium-filled Inconel exhaust valve set fits Ford EcoBoost 1.6L engines and is supplied as a set of 8 valves. The source lists these as sodium-filled Inconel exhaust valves and specifies use with KPR-5.0/7S keepers, making them a matched replacement set for the 1.6L EcoBoost exhaust valvetrain.
Supertech Ford EcoBoost 1.6L Sodium Filled Inconel Exhaust Valve - Set of 8 (Use w/KPR-5.0/7S)