All his sculptures and installations are made of recycled materials because the reuse of old material is an important aspect of his work. (elgawimmer.com)
You should trim their claws every 1 - 2 months and provide them with a scratching post to help them remove old material from their claws. (familypetclinic.org)
As I run into older material in my net surfing I add it regardless of how current (up to a point). (realclimate.org)