This product loudly yells “I’m good quality” in your face. The 100% silicone is smooth and silky to the touch. The balls feel solid and unrelenting in your fist. I love the varying shades of grey. The white one is the lightest and it reminds me of a ping pong ball. The blackest is the heaviest and it feels very weighty in my fist. I love that all of the balls are the same size.