Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Elkay Asana ELUH1511 Single Bowl Undermount Stainless Steel Bathroom Sink
Product description: Introduce inspired beauty into the bath with an Elkay Asana bathroom sink. The smooth curves of this collection create a compelling presence without overpowering the senses. Choose from striking finishes to complement your decor, including Lustrous Satin, Hammered Mirror and Copper.
Product feature: ADA COMPLIANT: Product is ADA compliant when properly installed., REPAIRABLE FINISH: Finish is scratch resistant to heavy-duty use. Deep scratches are repairable. Lustrous grain reflects light evenly for high shine., UNDERMOUNT INSTALLATION: Sink is installed beneath the countertop creating a seamless appearance between the sink and the countertop., SINGLE BOWL: Bowl gives you uninterrupted space for washing and stacking dishes or other household tasks., 18-GAUGE STAINLESS STEEL: Highest quality 18-gauge thickness and Type 304 stainless steel for lasting durability, performance and lustrous beauty., QUIET: Sound-deadening pad(s) minimizes sound and vibration for a quieter time at the sink., OFFSET DRAIN: Drain placement provides more usable space on the bottom of the sink and in the cabinet below.
Product price: $10.34
Product brand: Elkay
Target attributes: Material
Answer: attribute: material
value: stainless steel
source: product feature
attribute: material
value: stainless steel
source: product title