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: Sharpie 15001 Box of 12 Sharpie Pro King Size Chisel Tip Permanent Markers
Product description: The Sharpie Pro King Size Permanent Marker is rugged for long-lasting durability. Specially made for industrial users, the bold black markers write on greasy, wet and oily surfaces, while the sturdy plastic barrel withstands heavy use. These permanent markers built tough with an extra-large ink supply and versatile chisel tip.
Product feature: Powerful black ink marks on wet and oily surfaces, Large markers create clear lines on plastic, wood, stone, foil, metal, corrugate and leather, Quick-drying ink is fade and water resistant, Includes: 12 Black Sharpie permanent markers, Industrial strength for the toughest marking applications, Super-strong felt tip stands up to long use and tough jobs, Extra-large ink supply for big projects, Available in 3 bold colors
Product price: $10.97
Product brand: Sharpie
Target attributes: Specialty Ink
Answer: attribute: specialty ink
value: permanent markers built tough with an extra-large ink
source: product description
attribute: specialty ink
value: permanent marker
source: product description
attribute: specialty ink
value: permanent markers
source: product feature
attribute: specialty ink
value: permanent markers
source: product title