This profile gathers pirate CDs, which can be identified by 'Z xxxx' cat# on CD (where xxxx are 4 or 5 digits, for example, 'Z 1075' or 'Z 11105').
Matrix numbers usually are the same as cat#, but may contain some additional symbols (usually abbreviations, made from artist and release name).
These releases were manufactured by anonymous company for sale in Russia and near-by countries in the end of the '90s.
Usually they do not have any label logos. Releases with logos of known pirate labels, and with music of the '00s, are probably NOT from this manufacturer!
At least some releases have Mastering SID Code: IFPI LH35