Add to Cart Compare Quick view PreSonus PreSonus ULT-18-Caster Wheel Kit Caster Wheel Kit Now: $79.99 Was: Take a load off of your back when transporting your ULT 18 subwoofer with this stylish caster kit! Features 4" inch heavy duty casters for one (1) ULT 18 Subwoofer (2) Standard (2) Locking Full 360 degree swivel Mounting... Now: $79.99 Was: Add to Cart Compare Quick view