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: 250 A2 Cool White Envelopes Deckle Edge Felt Finish - Size - 4 3/8 X 5 3/4
Product description: 250 Cool White Envelopes Deckle Edge Felt Finish- National Envelopes - Details -Cool White Envelopes Deckle Edge Felt Finish - sub 80 - Size - A2 - 4 3/8 X 5 3/4
Product feature: 250 Cool White Envelopes Deckle Edge Felt Finish - National Envelopes, Qty - 250 - Size - A2 - 4 3/8 X 5 3/4, Details -Cool White Envelopes Deckle Edge Felt Finish, SUB 80 -Mohawk Ultrafelt -, Made in the USA
Product brand: National Envelopes
Target attributes: Material
Answer: attribute: material
value: a2
source: product title
attribute: material
value: a2
source: product description
attribute: material
value: a2
source: product feature