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: Tourna Restore Tennis Ball Pressurizer
Product description: Tennis ball pressurizer keeps balls fresh. Restore maintains balls at their original pressure of 14psi, stopping natural leakage that occurs through rubber during storage in unpressurized cans. Restore will also re-pressurize balls for extended play. Twist down top seals and compresses air in.
Product feature: Unit screws together and surrounds the ball, Unit holds 3 tennis balls, Restore maintains balls at their original pressure of 14psi
Product price: $11.17
Product brand: Tourna
Target attributes: High Grade
Answer: attribute: high grade
value: None
source: None