Gyroballs long-stretch ball spanner with rubbery supports that stretch you more, with max squeezein the middle. 

Strong 
Stretchy blend 
Material: TPR + soft silicone 
Phthalate free 
No scent 
Hourglass shape inner grip 

MEASUREMENTS: 
Width: 2 inch (5.08 cm) 
Outer circumference: 6.75 inch (17 cm) 
Inner circumference: 3 inch (7.62 cm)