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: Ringside Rubber Medicine Ball
Product description: The Ringside Rubber Medicine ball is a unique and versatile total-body training tool that helps develop muscular strength, endurance, power, stability, and joint integrity. The ball will bounce and it maintain its shape, It is extremely durable. Medicine balls can be used for a wide range of applications ? from slow and controlled moves all the way up to very fast-moving, ultra-dynamic ones. They can be held onto, tossed, bounced, and even slammed against nearly any surface, like rubber or hardwood floors, grass or artificial turf, even concrete. Sturdy rubber construction with a textured surface for superior grip Built to bounce off hard surfaces Helps develop core strength and improve coordination, balance, and endurance
Product feature: Sturdy rubber construction with a textured surface for superior grip, Built to bounce off hard surfaces, Helps develop core strength and improve coordination, balance, and endurance
Product price: $30.39 - $53.24
Product brand: RINGSIDE
Target attributes: Material
Answer: attribute: material
value: rubber
source: product feature
attribute: material
value: rubber
source: product title
attribute: material
value: rubber
source: product description