JBL Bags PRX900 Series Heavy-Duty Caster Board Kit for JBL PRX 918XLF Powered 18-Inch Subwoofer Speaker Case (PRX918XLF-CASTERBRD)

I bought this to go with my Peavey 18" sub. Yeah, I know it is expensive. Yeah, I know it is approximately 1/3 the cost of the sub. Do you know how heavy the sub is? Do you want to pack your sub across a venue? Yeah, thought so. Had to make little extensions to fit my handles, but having it stick out about 2" everywhere makes it so the board takes damage, not the sub when something bumps it.Only quibble is that it rolls so well, your speaker can roll on you on a nice smooth dance floor in the middle of a set. I recommend getting an old mic cord and looping the cable around the outside of the wheels like a lasso when you locate it as sort of a continuous wheel chock.I don't regret buying this. Neither does my back.