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: Nylon 6/6 Machine Screw, Plain Finish, Off-White, Fillister Head, Phillips Drive, 40mm Length, M6-1 Metric Coarse Threads (Pack of 100)
Product description: The off-white nylon 6/6 machine screw has a fillister head with a Phillips drive. Nylon 6/6 provides resistance to abrasion, corrosion, and many chemicals and solvents. The material is a strong yet lightweight plastic and is nonconductive. Nylon 6/6 can either absorb or lose moisture, which may alter its dimensions and mechanical properties. The Phillips drive has an x-shaped slot that accepts a Phillips driver and is designed to allow the driver to slip out of the head to help prevent over-tightening and damage to the thread or fastener. The fillister head has a slightly rounded top and tall cylindrical sides, enabling a deep drive slot for high driving force. This type of screw head is commonly used in counterbored holes., Machine screws are threaded fasteners that are typically used with nuts or drilled and tapped (threaded) holes. Machine screws are available with a variety of head shapes, which determine how the screw interacts with the mating surface, and drive styles, which determine the type of driver required to install and remove the screw.
Product brand: Small Parts
Target attributes: Quantity
Answer: attribute: quantity
value: pack of 100)
source: product title