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: uni-ball ONYX Rollerball Pen, Micro Point (0.5mm), Black, 12 Count
Product description: The uni-ball ONYX Rollerball Pen is built to be a great pen at a great price. Designed with a strong metal point to produce smooth, consistent writing, and finished off with a durable plastic clip, this roller pen will perform for years. The uni-ball ONYX pen also features uni Super Ink which protects against water, fading and fraud. Constructed from 80% post-consumer recycled electronics and featuring an economical design, these uni-ball pens are ideal for the office.
Product feature: Dependably smooth, free-flowing writing paired with a cost-conscious design, Made from 80% post-consumer recycled electronics, Features uni Super Ink which protects against water, fading and fraud, Strong 0.5mm metal tip for sharp, precise marks, Includes: 12 black uni-ball roller pens, 0.5mm micro point, Features uni Super Ink that protects against water, fading and fraud, Made from 80% post-consumer recycled electronics, Metal point writes with consistent smoothness, Available in Black, Blue or Red ink, Available in Micro or Fine points
Product price: $9.05
Product brand: Uni-ball
Target attributes: Type
Answer: attribute: type
value: rollerball
source: product title
attribute: type
value: roller
source: product feature
attribute: type
value: rollerball
source: product description
attribute: type
value: roller
source: product description