Pro-Tec Athletics High Density Spiky Massage Ball, Red

I bought this because it was advertised as high density, which usually means it’s solid inside — no air, no give — just firm pressure for proper muscle release. But this thing? Total letdown. When you press or bounce it, it absorbs the impact instead of staying firm. That’s the opposite of high density! It feels like there’s air or foam inside, not a solid core. Basically, it’s falsely marketed. I wanted something rock hard for deep tissue, but this is soft and spongy. Completely useless for what it claims to do. If you’re looking for real pressure or density, look elsewhere — this one’s a waste of money.