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: STCF Hand & MIDDLE FINGER Rubber Stamps wood stamps rubber Stamps rubber-stamp
Product description: Rubber Stamps can be as a birthday gift, Christmas gifts, children's day gift
Product feature: every one Stamps sizes range is 16 square kilometer to 25 square kilometer,Stamps size according to the actual situation
Product price: $8.99
Product brand: STCF
Target attributes: Material
Answer: attribute: material
value: rubber
source: product title
attribute: material
value: rubber
source: product description