Hastings 3.543"/90.00 mm Standard Bore, 6-Cylinder Ring Set with 2.00 mm Top Ring, 3.00 mm Second Ring and a First Oil Ring is 4.00 mm.
This Hastings 6-Cylinder Ring Set does not specify Ring Material or Ring Surface Treatment

Application Summary:

Year Make/Model
1972-1973 Mercury Capri
Attributes
1st Oil Groove 4.00
2nd Groove 3.00
Alternate Part Number 9100
California Proposition 65 No
Engborein 3.543
Engboremetric 90.00
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 2.00
GTIN 00075538011873