Forceps with alligator teeth：Suit for grasping flat foreign body (e.g. coin)
Forceps with prongs：Suit for grasping excised polyp , disease tissues and etc.
Forceps with rat teeth: Suit for grasping foreign body in complex shape (e.g. retrieval of non-regular shaped stent)
Forceps with pelican teeth: Suit for grasping special foreign body in big size (e.g. rubber, fabric)