The set includes three balls of different weights: 57 grams, suitable for beginners or at the beginning of treatment; 73 grams, suitable for the second phase of treatment or for advanced users; and 86 grams, suitable for perfect maintenance or advanced use. Thanks to the silky smooth, medical-grade liquid silicone, they glide perfectly during use. Once inserted, the pelvic floor muscles will start working, trying to keep the balls in place. Training Set 1 is so incredibly discreet that you can wear them without anyone noticing, secretly and playfully. Satisfyer balls are completely skin-friendly, phthalate-free and very hygienic. They are also hypoallergenic and perfect for even the most sensitive skin. Use a good water-based lubricant, such as Waterfeel or Nina Kiki, if necessary (avoid silicone lubricants). At Satisfyer, we strive for innovation, design and quality to satisfy you like no one else