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

Input:
Product title: Prime-Line Products U 10420 Cabinet Knob Back Plate, Satin Nickel,(Pack of 2)
Product description: Decorative cabinet knob back plate installs at base of knob for added decor. Used on Cabinet or Wardrobe doors., Decorative cabinet knob back plate installs at base of knob for added decor. Used on Cabinet or Wardrobe doors
Product feature: Satin Nickel Finish, 2-3/4 inch diameter, Easy to Install
Product price: $4.61
Product brand: Prime-Line Products
Target attributes: Type
Answer: attribute: type
value: knob
source: product description
attribute: type
value: cabinet knob
source: product title
attribute: type
value: cabinet knob
source: product description