Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Alvin SF1516019 Graphite 9H Pencil
Product description: A superior grade of graphite in the traditional hard cedar wood casing these pencils are exceptionally strong and can be sharpened to a clean fine point. Formulated to be extra-smooth and easily blended. Packaged and sold 12 per box.
Product feature: Formulated to be extra-smooth and easily blended., Packaged and sold 12 per box., Package Quantity: 1, Excellent Quality., Great Gift Idea.
Product brand: Alvin
Target attributes: Type
Answer: attribute: type
value: graphite
source: product description
attribute: type
value: graphite
source: product title