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From the letter of the law, the knife can be made of any material, whether stone glass, or even plant-based material, and anything else that is able to smoothly cut without tearing the skin. Nonetheless, it is a Mitzvah Min Hamuvchar to use specifically an iron knife. From the letter of the law, either a scissor or knife may be used, although the custom is to use specifically a knife. [It is customary for the knife to be not too long and not too short. It is to be sharp, and hence is to be well sharpened on occasion. It is customary for the knife to be double edged and be sharp on both sides. From the letter of the law, even if the knife contains a blemish it is valid to be used and in this regard is unlike the ruling by a slaughter knife. Nonetheless, in order to diminish the pain of the child as much as possible, it is therefore proper that the knife not contain any blemishes and be completely smooth.[2]]
___________________________________________________________________________[1] Michaber Y.D. 264:2; See Pesakim Uteshuvos 264:9
[2] Poskim in Pesakim Uteshuvos 264:9
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