Oxballs toys are shockingly superior - designed, made and tested in Los Angeles, CA. Made with super soft, platinum cure silicone that feels like it is part of you. The GRINDER-2 is designed to fit medium balls in a bigger size sack and huge nuts in a low-hanging bag. Safe with water based and oil based lubes. Make sure to warm up lube and ball stretcher by running it under hot water for a bit for easier application. Height: 1.75/4.5cm Inside diameter: 1 3/8/3.5cm Outside diameter: 2 5/8/6.5cm