Realizing that his species operates by hearing, Katma coaches him to create a hand bell with the ring, and describes the Green Lantern Corps as the "F-Sharp Bell Corps" — "F-Sharp" being a reassuring note for Rot Lop Fan's race in the same manner that green is a reassuring color, and the ring's powers in terms of sound instead of light. She also composes a new oath for him to recite: