These fresh-tasting, one-of-a-kind rope bones contain actual dental floss twisted in with all-natural cotton fibers. In addition, the BOODA® Fresh 'n Floss Spearmint Extra Small Rope Bone contains baking soda and fluoride to fight plaque and control tartar. All this and these rope bones are non-evasive and non-irritating to sensitive mouths and gums. The extra small rope bone is about 4" between knots and best for mini dogs and puppies under 8 lbs.