Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Rotosound rs66el Bass Guitar Strings
Product description: Costume for 4string swing bass series: 66Extra Long 456580105scalatura Features:Material: Stainless Steel Blue/Side Pull:drawn Hex Core Strings, made in the UK.
Product feature: Extra long, Made in the UK, So the sound of the bass in the foreground., Custom wound to engineering perfection..., Stainless Steel, Extra Long Scale
Product price: $23.98
Product brand: ROTOSOUND
Target attributes: Winding Material
Answer: attribute: winding material
value: stainless steel
source: product feature
attribute: winding material
value: stainless steel
source: product description