They've been designed to simulate the smooth gliding motion of a nursery glider chair. (checkpregnancy.com)
4moms rockaRoo Pierce LOVES the simple gliding motion of the rockaRoo and I love the smaller size than a traditional swing (my living room still kind - of resembles itself pre-baby.) (bumpclubandbeyond.com)
The metal ball bearings are sealed and this makes it to have a smooth, gentle gliding motion during rest and nursing time. (babieslounge.com)