"No effect from jinxes"
The Protection Ring is a Magical Ring that Link can obtain in Oracle of Seasons and Oracle of Ages. Link can acquire the ring by planting a Gasha Seed and finding it within a Gasha Nut. He can also acquire it in a Seed Ring form by bumping into Maple. The ring can also be obtained through a Fortune Link at Vasu's jewelry store.
When equipped, the Whisp Ring will make Link immune to the Jinx effect given off by Whisp enemies. Without the ring, if a Whisp hits Link, he will be unable to use his Sword and other weapons for a period of time.
Given that Whisps aren't too common in Oracle of Seasons and Oracle of Ages, the Whisp Ring does not have many occasions where it is practical to use.