NuPulse milker claws are unique because the pulsator is built into the claw body. The key element to the NuPulse Clawis the gentle milking action that is controlled by the cow. The more milk she gives the faster the pulsator works - as her milk slows down, the pulsator slows causing less stress on the teat ends. These are perfect for those who want minimal equipment and DIY milking machines!  We carry a nice selection at Farm & Ranch Depot!