ProX XS-SP322127W Universal Line Array Speaker Flight Case w/Caster WheelsProX XS 322127SPW Universal Line Array Speaker Flight Case with Caster Wheels Holds QSC KS118 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 professional speaker case employs a 3 8" Laminated Honeycomb Plywood that has a hard shell