The Pk-66 Ultimate is an old LOC standard. Sporting 7x 29mm motor mounts, 6 fins and a payload. This kit is made to handle your transition into the cluster realm. One of the Retro series it's not for the faint of heart. Light weight and made to punch a hole in the clouds! A 30+ year old classic! The 29mm motor mounts have been separated slightly to better accommodate today's thrust ring motors. Some minor motor modifications may still be needed for 7 motor flights. All LOC/PRECISION 4" Advanced series kits include heavy duty airframe and motor mount tubes, high-grade precision-cut plywood fins, centering rings, rip-stop nylon parachute or streamer, nylon webbing shock cord with sewn loops and mount, and polypropylene nose cones. Apogee Components Video Review! DESCRIPTION Complexity: Intermediate-Advanced Diameter: 4″ Height: 58.75 Weight: 3lbs. Motor Mount: 7x29mm cluster Parachute Size: 42″ Ripstop Nylon Shock Cord Type: NW-20 20' 3/8″ Nylon with sewn loops Shock Cord Mount: SCM-3 Eyebolt Fin Thickness: 1/8″ Ring Thickness: 1/4″ Instructions: PK-66 Ultimate Instruction SheetVinyl Decal: Included, logo only