Replace shower faucet valve stems

That those are 1/4 turn or limited turn I would say they are washer-less valves. I would look around the outside of the body of the valve to see if there is a set screw / grub screw holding the cartridge in place, if you can not find a screw look closely at the brass hex piece that is cut out for the stop. Is that threaded on the outside if so it may unscrew or be a packing I am not sure but that is a possibility. If it is a packing the clip and stop will probably need to be removed to unscrew and not damage the cartridge. Replacement o rings should be easy to find once you get it apart.

Thank you Ed Beal. Yes, these are washer-less ceramic valves. I changed the cartridge and it was simple than I thought. Basically you remove the plate and turn the chrome sleeve counter clockwise to remove it. Then use a channel lock to loosen the cartridge by holding the edge of the cartridge and turning it counter clockwise. Installed a new cartridge and gave it a gentle tight snug. No more leaks and shower works very well.

Please see the pics I took.

This is the cartridge part number

After removing plate and sleeve

After loosening the cartridge

Cartridge removed

Installed a new cartridge