COLT's 12-Functions-in-One Vibrating Kettlebell Ring - Black is the premium choice! Crafted with comfy, stretchy silicone, it's 160g of weighty bliss, totally waterproof, and can be recharged in 50 minutes with just a USB cable. (Short break for back-breaking gains!) Ready to rock? Colour: Black. Dimensions: 1.5" ring diameter, 4.25" x 2" overall. Materials: Silicone.