Core ballstretcher best feature is the outer ribs for super long springy-stretch it stays taller on your sack with more padded grip in the middle for a fatty bag-squeeze. 

Core fits your nuts with a smooth hourglass inner sleeve on your nutbag... this slick tunnel wraps your sack with a medium firm squeese while the outer ribs keep your stretched down for real low-hangers. 

Made with extra-soft plus-silicone blend, it'll keep the grip enough with a smooth velvety rubbery comforable stretch, and the right slippery grip for more play. 

Core ballstretcher has more squeeze insid 
Core has springy ridges outside for more push-down 
Hourglass inner shape grips more when you need 
Thicker rubber rim will not dig into sack 

Measurements: 
Length: 2 inch (5 cm) 
Width: 2 inch (5 cm) 
Outer Circumference: 7 inch (18 cm)