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: Combination of Life Low Profile Nesting Clear Acrylic Risers for Displays Set of 6 (2 Sets of 3)
Product feature: Sturdy 1/8" thick acrylic construction., Great for displaying small accessories. Clear acrylic design keeps the focus on your product., Nesting design for ease of use and transport. Place together or use separately., Size of 6 Risers: (2) 5.8" x 5.8" x 2.5". (2) 4.75" x 4.75" x 1.75" (2) 3.5" x 3.5" x 1.25"., Note: Please remove both sides' protective plastic thin coating before your use to reveal the high quality reflective surface.
Product price: $16.89
Product brand: Combination of Life
Target attributes: Countertop Style
Answer: attribute: countertop style
value: None
source: None