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: TUL RB1 Roller Ball Pens, Medium Point, 0.7 mm, Silver Barrel, Black Ink, Pack Of 12
Product description: Innovative, sleek design is fine-tuned for precision writing. Refillable: No. Ink Color: Black. Point Size: 0.7mm. Pocket Clip: Yes. Grip: Yes. Retractable: No. Point Type: Medium. Barrel Color: Assorted. Quantity: 12. Smooth liquid ink flow. Precision writing tip for sharp, accurate writing. Elastomer comfort grip. Each pen is hand-tested for superior performance. Disposable
Product feature: Smooth liquid ink flow, Precision writing tip for sharp, accurate writing, Elastomer comfort grip, Each pen is hand-tested for superior performance, Disposable
Product price: $18.05
Product brand: TUL
Target attributes: Type
Answer: attribute: type
value: roller ball
source: product title