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: Sabatier French Bolster Chef Knife
Product description: This Sabatier French Bolster Chef Knife is great for chopping, dicing, slicing and mincing a variety of fruits and vegetables. The blade is constructed of superior quality, high-carbon stainless steel that holds an ultra sharp edge, providing strength & durability. Features traditionally styled triple rivet handle. The French style bolster will add elegance to your kitchen. Hand wash. French Bolster Chef Knife has an 8 inch long blade.
Product feature: Length : 8 in.
Product price: $149.99
Product brand: Sabatier
Target attributes: Set Size
Answer: attribute: set size
value: None
source: None