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: X-LOOP NEW MENS BASEBALL SPORTS SUNGLASSES XL3796
Product feature: plastic frame, plastic lens, non-polarized, Lens width: 40, Package Dimensions: 5.9 x 2.7 x 1.6 inches, Shipping Weight: 2.4 ounces, ASIN: B00DGVM4WC, Date first listed on Amazon: June 18, 2013, Average Customer Review: 2.6 out of 5 stars 2 customer reviews
Product brand: X LOOP
Target attributes: Silhouette
Answer: attribute: silhouette
value: None
source: None