Each balls is hand made so colors and designs will vary. Our wool is never dyed except with natural, plant based dyes like beets and onion skins and only washed with biodegradable soap so you can rest assured your furry friend will be playing with an all natural product. From all reports the balls have lasted hours,months, to years depending on your pet. For you feline folk, some folks have suggested “cat nipping” the scent but reports are the cats don’t seem to need extra incentive. As for dogs, well, we can say first hand wool is an irresistible material. We handle the wool very little so not to remove the natural sheep essence they find so yummy.