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: Shells® Black Color Credit Card Size Safety Military Survival Folding Knife Stainless Steel Sharp Blade
Product description: Black Color Credit Card Size Safety Military Survival Knife Stainless Steel Sharp Blade
Product feature: Credit Card Size, Folding Knife, Stainless Steel
Product brand: Shells Group
Target attributes: Type
Answer: attribute: type
value: folding
source: product title
attribute: type
value: folding
source: product feature