Replace shower faucet valve stems
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