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: CUTCO Model 1722 Butcher Knife with White "Pearl" handle.......8" High Carbon Stainless blade and 5 3/4" handle....... in factory-sealed plastic bag
Product description: Strength and accuracy are hallmarks of the CUTCO Butcher Knife. The wide belly and clip point that are hallmarks of the CUTCO Butcher Knife, allow for accuracy when segmenting and trimming larger cuts of meat, and larger items like melon, squash and pineapple.
Product feature: America's #1 brand in quality cutlery for over 60 years, CUTCO Forever Guarantee provides for free sharpening and replacement forever, Strength and durability mean this will be used for seasons to come., Full Tang, Triple Rivet Construction --- High Quality Nickel-Silver Alloy Rivets., Highly engineered thermo-resin ergonomic handles will not crack, chip, fade or absorb material
Product brand: Cutco Cutlery
Target attributes: Set Size
Answer: attribute: set size
value: None
source: None