TubiGrip Beige Sz B 2 1 2 Dia 33' Rebounder Exerciser Balls Colors White w Black Case Frequency H300 is the third Colors White w Black Case Frequency Range 219~5663 Hz Total Harmonic Wave Distortion 0 Heavy duty vinyl with Permablok 3(R) bacterial protection * 1´ Firm density foam tops * Radiused seamless corners on upholstered components * Top sections have welded steel support frames * Pivoting joints house hardened steel shoulder bolts with locking nuts to ensure years of trouble free operation * Footswitch control * Power assisted caster system (unless noted otherwise) * 110 volts 60Hz motor * 100% cotton covered elastic threads form a continuous spiral * Doesn't stretch lengthwise * Washable autoclavable * 33' (10 meters) roll * Packaged in dispenser box