The release is Manchester parish records 1541 – 1985. The original records are held by the Manchester Libraries and Archives. A list of parishes is available online at Ancestry, in all 64 parishes are included.
A while ago FindMyPast also released a collection of Manchester records from the same source, their collection consists of apprenticeship records, cemetery & death records, school admissions & discharges, prison registers and workhouse registers.
So between the two rivals there is a splendid range of records for those with Manchester ancestors. This should keep my friend, Jill, whose family on both sides comes from within a small radius of Manchester, very happy !!