Shower Valve / Cartridge Inquiry

[FlagshipOne]

was wondering if anyone could tell me what kind / type of cartridge this is? I need to replace them but am unsure what to ask for when I go looking. pictures attached.

 

[SHR]

You have to take out the stem and bring it with you to match by sight. Of course, turn off water to the valves first. Always replace both hot and cold seats and stems at the same time.