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: 6MM/8MM Plated Black Tungsten Ring Plain Classic Dome High Polish Comfort Fit Wedding Band
Product description: Our tungsten rings are all free cobalt.We offer the high quality product and reasonable price., Tungsten rings advantage:, 1.Hard and dense:about 9 Mohs hardness scale,that's 10 times harder than 18k gold, 6 times harder than tool steel,and 5 times harder than titanium., 3.Never deformed:No matter what the situation, it can maintain its original shape.But, if you're not careful it fell above 1.8M high places, it will be broken., 4.Highest melting point:3400 degrees.
Product feature: Tungsten Metal, Dome, Plated Black, High Polished Design, Hypoallergenic, Comfort Fit Design, Width:6mm or 8mm for choice, Comes with a FREE Ring Box, Package Dimensions: 1.9 x 1.9 x 1.3 inches, Shipping Weight: 0.8 ounces, ASIN: B00KFC0NTQ, Item model number: SOM-W-08080B-075, Date first listed on Amazon: May 19, 2014, Average Customer Review: 3.9 out of 5 stars 11 customer reviews
Product brand: SOMEN TUNGSTEN
Target attributes: Silhouette
Answer: attribute: silhouette
value: wedding band
source: product title