Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: TK Field Hockey Backpack
Product description: TK Equipment Bags - TK Field Hockey Backpack - Item: HO2TK6BP12
Product feature: TK TK Field Hockey Backpacks, Spacious back with plenty of extra pockets External pocket and stick tube Front sleeve organizer and MP3 pocket Dimensions: 18 inches x 12 inches x 8 inches Colors: black, navy, red, pink
Product brand: TK
Target attributes: Material
Answer: attribute: material
value: None
source: None