The JBL WK-4S Subwoofer Caster Kit is a professional-grade, four-piece wheel set engineered to drastically improve the mobility and logistics of high-end touring subwoofers. Constructed with heavy-gauge, zinc-plated steel frames and industrial double ball bearings, these heavy-duty swivel casters provide effortless 360-degree maneuvering of dense speaker cabinets across demanding venue environments. Each individual caster is rated to support up to 130 pounds, granting the complete kit a robust total rolling capacity of 520 pounds to easily handle large-format active subwoofers like the SRX828SP or VRX918S.

Designed for quick, tool-free integration, the top mounting plates align natively with the pre-threaded rear insert holes on compatible JBL cabinets, eliminating the need for drilling or wood modification. The wheels feature non-marring, soft-ride polyurethane treads that roll smoothly over rough outdoor terrain while protecting delicate facility floors from scuffs and damage. Furthermore, the low-profile 4.5-inch design ensures the wheels seamlessly clear factory-padded transport covers, allowing production crews to protect their gear from dust and moisture during load-out without needing to remove the casters.