Hastings 2C4902 piston ring set for Toyota 3.0L V6 1MZFE DOHC 87.50 STD comes with 6 ring sets. 

87.50mm 1.2mm 1.2mm 3.0mm

These pistons rings can also be used on the later model 1UZFE VVTi engines with the 1.2mm piston ring land.

Top ring:
Ring profile: BARREL FACE
Ring material: STEEL
Ring coating: CHROME

2nd ring:
Ring profile: REVERSE TORSIONAL
Ring material: GREY IRON
Ring coating: PHOSPHATE

3rd ring:
Ring profile: 3 PC. FLEX-VENT
Ring material: STEEL RAIL/ STAINLESS EX
Ring coating: CHROME RAIL