cHu-buDDy tubes are made from an NSF 61 compliant, non-toxic material that is BPA-free, pthalates-free, latex-free and lead-free. Come with an 8" tether that makes it easier for them not to lose. cHu-buDDy tubes are made for aggressive chewers and moderate chewers. Tubes are warranted to not be chewed through for 90 days from purchase. 3CHTUY-Yellow, 3CHTU-Blue, 3CHTUG-Green and 3CHTUB-Black.