Your Strength score is 19 while you wear these gauntlets. They have no effect on you if your Strength is 19 or higher without them.
Notes: Set: Strength Score, Buff, Handwear
It's all ogre now.
If you're a player who has these gauntlets and the DM gives you belt of giant strength DON'T GET RID OF THESE just because the belt gives you more STR. The reason for this is because the DM could be planning to give you the Hammer of Thunderbolts in the future,and that hammer requires you to be attuned to both Gauntlets of Ogre power and belt of giant strength ''any variety''.