ProX XS-292922SPW Universal Flight Case Dual Line Array Speakers or Single Subwoofer w/Caster WheelsThe ProX XS 292922SPW is the perfect case for AV production companies, touring bands, entertainment groups, and mobile DJs. This case rests on four 4" casters designed for easy traveling, it also comes equipped with caster dishes on top to facilitate stacking with other flight cases. This case stores up to stacked line array speakers or fits 1 Subwoofer. This professional speaker case employs a 3 8" Laminated Honeycomb Plywood that has a hard shell