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: Wheel Master Velocity Chukker Wheel Set - 700c x 35, 9-Speed, 36H, QR, Silver NMSW
Product description: WHL PR 700 VELO CHUKKER SL 36 T610 SL 135mm DT2.0SL
Product feature: Rims: Velocity Chukker, 700c x 35, 36H, double wall, non-machined sidewall, silver, Hubs: Shimano M590, 9-speed, quick release, silver, Spokes: 2.0, stainless steel
Product brand: WheelMaster
Target attributes: Style
Answer: attribute: style
value: None
source: None