Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Regal Tip RN-107NT-W 7A Wide Neck-Nylon Tip US Hickory-Single Pair
Product description: Nylon tipped, 'Short and Swift' design with .510" diameter, 15.00" length. Wider neck design has a shorter taper and features Regal Tip's lacquer formula finish for non-slip grip. Regal Tip is a family operation that has set the global standard for hand-crafted brushes and drumsticks for over 50 years.
Product feature: 16.25" length x .560" diamenter, Acorn-shaped tip, The wider taper allows players to play their style and have a durable stick for other venues, A wider stick, a Regal Tip nylon tip, and Regal Tip's famous finish--What else could a drummer want? Play harder and longer with Regal Tip's Wide Series nylon tip drumsticks, The wider taper allows players to play their style and have a durable stick for other venues
Product brand: Regal Tip
Target attributes: Size
Answer: attribute: size
value: 7a
source: product title