From the "Birdsafe Naturals" Collection -- Birdsafe Naturals contain no dyes, no plastics, only safe natural wood and cotton rope. We do use nickel plated and stainless steel links and chain for safely hanging toys since they can be heavy. The Birdsafe CottonWood Mini is a 4" section of soft wood with 5/16" superior cotton rope through four sections. Great chewing and preening fun. Hangs about 8" total length on short chain and pear link, with stainless steel eye bolt into wood.