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The Seismic Trucks combined with the Seismic Springs are the perfect system to tune up your trucks exactly on what you want in and out of a turn while skating or longboarding. Just choose the strength you want and be even more exacting then only with bushing tuning. Click on your body weight for more Information: 35 kg 45 kg 57 kg 68 kg 79kg 91kg 102+kg Price per pair, for 1 truck Choose your spring strength by color.