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: Justin 4767 - Black Pitstop Steel Toe Work Boot
Product description: 10" black pitstop medium round steel toe, electrical hazard rated, double comfort system insole, polyurethane outsole. , handcrafted in the usa
Product feature: polyurethane, polyurethane sole, 10" black pitstop medium round steel toe, Shipping Weight: 5.19 pounds, ASIN: B00449ZTHC, Item model number: 4767, Date first listed on Amazon: October 16, 2012, Average Customer Review: 1.0 out of 5 stars 1 customer review
Product brand: Justin Work Boots
Target attributes: Type
Answer: attribute: type
value: boots
source: product brand
attribute: type
value: boot
source: product title