The Hello Kitty makeup brushes are available in various sets, with different numbers of brushes and designs. Here are some details about the products and their ingredients or materials:

• Decorating 7 Pcs Professional Pink Hello Kitty Soft Makeup Brush Set with Box: The brushes are made of soft material plastic and are small in size, making them easy to carry in a purse. No information is available about the ingredients or materials used.

• Hello Kitty Luv Wave Brush Collection (Set of 5) - The Crème Shop: This product is cruelty-free, paraben-free, sulfate-free, and vegan. No information is available about the specific materials used.

• Hello Kitty & BT21 Dreamy Essentials Makeup Brush Collection (Set of 8) - The Crème Shop: The brushes are crafted with plush synthetic bristles. No information is available about the specific materials used.

• Hello Kitty Makeup Brush Set - Marvie Beauty: This set includes 7 brushes for eyes, lips, and face, all with Hello Kitty details. No information is available about the specific materials used.

• Sephora Collection Hello Kitty Brush Set - Beautylish: The brushes come in a metallic silver Hello Kitty container and are revealed by lifting the lid. No information is available about the specific materials used.

• BT21 & Hello Kitty Dreamy Essentials Makeup Brush Collection (Set of 8) - Line Friends: The brushes are made of PS, aluminum, and nylon.

Overall, the Hello Kitty makeup brushes are generally made with synthetic bristles and are cruelty-free, paraben-free, sulfate-free, and vegan. However, specific information about the materials used is not always available.