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: Ferplast ERGOFLEX C22/42 Purple Collar Dog Collar, Purple
Product description: Innovation for dogs: that's the answer to all your needs! Ergo flex dog collars are made of a new material, Techno-rubber, which is robust and flexible at the same time, 100% safe for your animal, non-toxic and hypo-allergenic, very hygienic since washable and water-proof. The special material is besides anti UV, low-high temperature resistant and shock absorbing. Ergo flex collars have a patented micro-regulation system, are easy to fit and adjust on your friend's neck. The colors available are bright and fashionable! In the same range, you could also find collars with holes and metal buckle, leads and harnesses. Choose the model in compliance with your pet's size.
Product feature: Innovative robust and flexible material: Techno-rubber, Easy to fit thanks to the micro-regulation system, Safe for your animal: non toxic and hypo-allergenic, Hygienic and practical: washable and water-proof, low-high temperature resistant, anti UV, Range with different sizes available, trendy bright colors to meet all tastes
Product brand: Ferplast
Target attributes: Size
Answer: attribute: size
value: None
source: None