Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: uni-ball 207 BLX Infusion Retractable Gel Pens, Medium Point (0.7mm), Blue/Black, 12 Count
Product description: Add a touch of personal expression to your work with uni-ball 207 BLX Infusion gel pens. The unique BLX Infusion series features black ink with a hint of color. uni-ball 207 BLX Infusion also features uni Super Ink which helps protect against water, fading and fraud. The specially formulated pigment based gel ink contains particles that form an indelible bond in paper- it cant be broken...ever. Experience color like never before with 207 BLX Infusion retractable gel pens.
Product feature: Make a statement with unique Blue/Black gel ink, Premium grip provides superior writing comfort and control, Features uni Super Ink which protects against water, fading and fraud, Sleek black barrel accents add a dash of class to your writing, Includes: 12 gel pens featuring black ink infused with a hint of blue color, Features exclusive uni Super Ink that protects against water, fading and fraud, Choose from a smooth or subtly textured grip, Available in a range of styles, ink colors and point sizes
Product price: $11.99
Product brand: Uni-ball
Target attributes: Type
Answer: attribute: type
value: gel ink
source: product description
attribute: type
value: gel
source: product description
attribute: type
value: gel
source: product title
attribute: type
value: gel
source: product feature
attribute: type
value: gel ink
source: product feature