This colourless blender pencil by Prismacolor is sold singly. It blends and softens hard edges on coloured pencil artwork, so you can achieve
Colorless Blender Pencils
Prismacolor 962 Premier Colorless Blender Pencils, 2
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Prismacolor Colorless Blender Pencil
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Prismacolor blending pencil
Prismacolor 962 Premier Colorless Blender Pencils, 2-Count : Wood Colored Pencils : Arts, Crafts & Sewing