Trucks are sold in pairs. 

Lightweight by design
Solid axle
Premium grade hollow kingpin
Custom forged aluminum baseplate
90du clear green bushings

SIZES:

145: 7.62" Axle - For boards 7.4" - 7.9"
147: 8.0"Axle - For boards 7.9" - 8.12"
148: 8.25" Axle - For boards 8.12"-8.38"
149: 8.5" Axle - For boards 8.38" - 8.62"
151: 8.75" Axle - For boards 8.62" -8.86"

GUARANTEED FOR LIFE