Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: SHIMANO MT15 26 QR WH-MT15-A-26
Product description: Quality, durable off-road wheels
Product feature: Precision hand built assembly for extended service life, In-house produced rims and hubs and spokes, 23.3mm wide rim profile (19C), Angular contact bearings with double contact high quality sealing, Center lock is a quick, simple, lightweight and effective rotor mounting system
Product brand: SHIMANO
Target attributes: Position
Answer: attribute: position
value: None
source: None