Spec
Yes4All Spiky Massage Ball Set
Pro-Tec Orb Extreme
Price
$12
$17
Rating
4.5 ★
4.6 ★
Diameter
2.9 in
4 in
Firmness
6/10
9/10
Vibration
None
None
Battery
N/A
N/A
Weight
4.2 oz
8.5 oz
+2-pack under $15
+Spikes stimulate circulation
–Spikes too much for some
–Softer core
+4in size for glutes/quads
+EVA holds shape
–Too big for feet/forearms
–Very firm