THIS IS THE NEW STYLE 4 BLADE .( NOT THE OLD JET SKI IMPELLER ). STAINLESS STEEL PRE. - LOADER 4 BLADE ISF INDEXED SUPER FLOW INDUCER , BLUE PRINTED . HELPS HOLE SHOT - REDUCES CAVITATION . KEEPS PUMP HOOKED UP UNDER EXTREME CONDITIONS . SELLING INDUCER , MACHINE KEY , AND TAPERED SPACER . ALSO COMES WITH A SPACER IF YOU WANT TO REMOVE INDUCER . IF YOU WANT TO GO FAST , THIS IS WHAT YOU NEED , FITS BERKELEY JET PUMP , AND MANY OTHER JET PUMPS . FOR PUMPS OVER 400. HP. EVERY THING IN NEW CONDITION UNUSED . (MACHINING OF YOUR SHAFT IS REQUIRED .) ( THIS INDUCER SELLS FOR $ 630.00 ,+ BLUE PRINTING $ 160.00 = $ 790.00 . + SHIPPING .)  ( YOU CAN BUY FOR $ 530.00.) THERE ARE NO REFUNDS . MAKE SURE THIS IS THE PART YOU WANT .