Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Hickory Hardware PA0213-MB 1-Inch Metropolis Cabinet Knob, Matte Black
Product description: Often characterized with clean, sleek lines. Marked with solid colors, predominantly muted neutrals or bold bunches of color. An emphasis on basic shapes and forms., Often characterized with clean, sleek lines. Marked with solid colors, predominantly muted neutrals or bold bunches of color. An emphasis on basic shapes and forms.
Product feature: Matte Black, Round, Metropolis collection, Diameter: 1 inch, D: 1 inch p: 1-1/4 inch, Matte Black Finish, Mounting Hardware Included, Metropolis Collection
Product price: $4.00
Product brand: Hickory Hardware
Target attributes: Material
Answer: attribute: material
value: None
source: None