"Cracked floors don't crumble"
Roc's Ring is a Magical Ring that Link acquires in Oracle of Seasons and Oracle of Ages. Link can acquire the ring by planting a Gasha Seed and finding it within a Gasha Tree. Link can also acquire it in a Seed Ring gained by bumping into Maple.
When Link wears the Roc's Ring, it prevents him from falling through cracked floor tiles in the ground. It is useful in Oracle of Seasons after acquiring Roc's Cape, since Link encounters a number of cracked floor tiles.