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: Terrier Dog Rubber Stamp, Yorkie, Westie, Cairn Terrier
Product description: This is a deeply etched, finely detailed rubber stamp mounted on high quality white maple wood block with hourglass sides. All of our stamps are new stamps and ship directly from our workshop in Ohio. ruler may be shown to indicate the relative size of this/these stamp(s) and is not included.
Product feature: Approximate Image Size: 1 3/4" x 1 1/4", This is a deeply etched, finely detailed rubber stamp mounted on high quality white maple wood block with hourglass sides., Made in the United States of America with the highest Quality Materials and Workmanship., Please view our wide selection of similar rubber stamps!, Manufactured by RubberHedgehog rubber stamps in Ohio, USA.
Product price: $8.00
Product brand: RubberHedgehog
Target attributes: Material
Answer: attribute: material
value: rubber
source: product feature
attribute: material
value: rubber
source: product title
attribute: material
value: rubber
source: product description