Fits the tunnels of the GF riser Allows the distribution of the weights in front or back of the riser to get better balance. G24-BW-06-102 mm bar, 4 x GSX-CW Compound Weights and 3 G03-NS-01-25 Neoprene springs G24-BW-06-125 mm bar, 7 x GSX-CW Compound Weights and 3 G03-NS-01-25 Neoprene springs