- 2 kegel balls included - Material: Medical grade Silicone and ABS, Phthalate free - Function: Kegel exercise ball - IP grade: IPX7 waterproof - Size: single ball: 100 x 35 x 35mm; twin ball: 154.6 x 35 x 35mm - Color box: 128 x 98 x 40mm - N.W.: 128g