This is infomation from Wiseco:
All Wiseco rings can be used in cast iron, nickel ceramic platings (Nikasil), boron composite, and Electrofusion bores.
CAUTION: Unless otherwise noted, Wiseco rings can NOT be used in chrome plated bores. Engine damage will occur.
*CSM & CDM rings are designed to be used in chrome bores.
CSM: Nodular iron, phosphate coated, internally notched
(for use in • Chrome Bores)
CDM: Nodular iron, phosphate coated, internally notched
(for use in • Chrome Bores)