Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Staples Better 1-Inch D 3-Ring View Binder, Yellow (19064)
Product feature: 1-inch D-rings hold more than typical round rings, Holds 275 sheets for ample storage, For superior durability, the rubberized spine and edges of the Staples 1-inch D-ring binder allow the covers to resist rips and tears, Thanks to the one-touch mechanism, the binder rings open simply for quick reorganization of stored sheets of paper, The Staples nonstick Better binder has an easy-insert spine that allows the title to be read when the binder is placed on a shelf, Clip this coupon to save $1.00 on this product when you buy from Amazon.com. Here's how (restrictions apply)
Product price: $16.49
Product brand: Staples
Target attributes: Number of Rings
Answer: attribute: number of rings
value: 3-ring
source: product title