The Love Story Valkyrie Vaginal Balls are designed for pelvic floor muscle training. The package includes a silicone case and four balls of different weights. All the balls are made from hypoallergenic silicone. Each ball has its own weight: 25g, 35g, 44g, and 55g. For easy identification, they are all painted in various shades from light (pink) to dark. The 25g and 35g balls feature a shifted center of gravity, which creates additional light vibrations during use. The 44g and 55g balls have internal weights. With the silicone case, you can easily switch the balls according to your fitness level: from beginners to advanced. Care: rinse the package in lukewarm water before and after use, dry, and treat with a toy cleaner.