Abstract: A slurry containing abrasive grains and a liquid medium, in which the abrasive grains include first particles and second particles in contact with the first particles, the second particles contain at least one metal compound selected from the group consisting of a metal oxide and a metal hydroxide, the metal compound contains a metal capable of taking a plurality of valences, and a ratio of the lowest valence among the plurality of valences of the metal is 0.10 or more in X-ray photoelectron spectroscopy.

Abstract: A device (10) for applying a bunch of synthetic hair comprises a cylindrical body made of an elastic material having a synthetic hair retaining hole (12) formed therethrough along a center axis of the cylindrical body. Further, the retaining hole has an opening at either end of the cylindrical body and is adapted to hold a person's hair (26) and hair extensions (28) in the hole. In addition, a pair of tapered surfaces is provided on an outer surface of the cylindrical body, with the tapered surfaces reducing in diameter from a center of the cylindrical body to the respective ends of the cylindrical body.

Abstract: A device (10) for applying a bunch of synthetic hair comprises a cylindrical body made of an elastic material having a synthetic hair retaining hole (12) formed therethrough along a center axis of the cylindrical body. Further, the retaining hole has an opening at either end of the cylindrical body and is adapted to hold a person's hair (26) and hair extensions (28) in the hole. In addition, a pair of tapered surfaces is provided on an outer surface of the cylindrical body, with the tapered surfaces reducing in diameter from a center of the cylindrical body to the respective ends of the cylindrical body.