Layla; Bell

Kaho holding the Moon Bell

The Moon Bell (also called "Bell of the Moon" or "Bell of Second Chance"')' is the magical bell possessed by Kaho Mizuki passed down to her by Clow Reed, when they met at an university in England, to give Sakura Kinomoto a second chance during the Final Judgement. The Bell vanished after being used during the Final Judgement.

It was, also, used to defeat The Maze card from the inside by breaking it's walls allowing Sakura, Tomoyo, Syaoran, Meiling to escape and seal the card. It was first seen in episode 26.

The Moon Bell appears to be some type of half-moon tambourine or horseshoe wrist bell (馬蹄鈴).

Horseshoe or Half Moon Bell