Tldr: Most of my guinea pigs are not interested, but for the pigs who seek out paper, string, and fabric, this is a must-have.I have had seven guinea pigs over the course of my life time, and none of them have been particularly interested in chew toys before.I recently adopted two young guinea pigs who are professional menaces; one of them loves to dig, and the other loves to chew and eat things that are not food. She has unlimited timothy hay, varied fruits and veggies twice a day, occasional pellets, forage, treats, and pea flakes, as well as a full sized c and c cage full of wood, cardboard, and plastic hides, timothy chew sticks, and another guinea pig companion.And yet; she is constantly on the hunt for non food items! Toilet paper, paper towels, fabric, and string. She loves to chew the draw strings on my clothes when she sits on my lap. She will seek them out whenever she hears or smells them, or if she remembers finding something there before. She will forego her favorite snack (apple), warm and cozy blankets, and the familiar safety of her enclosure for it.She doesn't just chew on it, she fully eats it. It is normal for guinea pigs to chew on things, particular things like cardboard hides and strawberry-soaked paper towel, but this is another level. So much so that I contacted her vet about it despite her recently getting a full bill of health from her annual check-up.All of this is to say, I am constantly looking for safe, edible products that will satisfying my guinea pig's pica tendencies. I don't want to stop this behavior, but rather provide safe alternatives that allow her to feel happy and enriched without me worrying about her either being under stimulated or at medical risk.Both pigs have gone crazy for these balls. The second I drop them in their cage, they are both running to chew on it, to the point where they are fighting over it, and I need to give them a second.So far, the Hyacinth ball is their favorite, with Corn Leaves and Seaweed being a close second. I'm thrilled to be able to satisfy their natural need to chew without worrying about them ingesting something dangerous.The balls do get torn apart, but that is to be expected. Some have lasted a couple days, and others a couple weeks. I have yet to find a ball they're not interested in but I haven't tried them all. I'll definitely be buying more when these run out.