Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Guess Mens 'GU 6608P' Polarized Designer Sunglasses, Brown / Brown
Product description: Guess GU6608P is Rectangular style Men Sunglasses design. These Sunglasses are comfortable to wear in addition to being fashionable.
Product feature: composite frame, composite lens, non-polarized, Lens width: 60 millimeters, Model No : GU6608P, Frame Color :SHINY BROWN, All eyewear come with original case, cloth and manufacturers papers., Guess men Sunglasses, Size : 60x13x135, Package Dimensions: 7.3 x 3.1 x 1.6 inches, Shipping Weight: 2.4 ounces, ASIN: B00AS7K1SG, Item model number: GU6608P-BRN-1-60-13, Date first listed on Amazon: December 23, 2012, Average Customer Review: 3.8 out of 5 stars 11 customer reviews
Product brand: GUESS
Target attributes: Silhouette
Answer: attribute: silhouette
value: rectangular
source: product description