The LOC-IV is one of the ADVANCED SERIES of kits, which include factory pre-slotted airframe and through-the-wall fin construction, Now including payload section! The LOC IV has been the best selling kit in our history (perhaps all of high power history as well) Recently upgraded to 38mm motor mount and to-the-motor mount construction, this kit is the perfect Level 1 certification rocket kit. You can even park fly it well on F and G motors with the optional MMA-2 motor adapter. As evolution would have it, this 4-inch LOC-IV rocket kit now sports a 23" booster section and 11" payload for optional dual deployment set up. PK-48 LOC IV Instructions Level 1 certification tips YouTube Vid! RockSim DESCRIPTION Complexity: Intermediate-Advanced Diameter: 4″ Height: 47″ Weight: 2lbs. Motor Mount: 38mm with MR-1 Retention Parachute Size: 36″ Ripstop Nylon Shock Cord Type: NW-15 15' 3/8″ Nylon with sewn loops (not elastic) Shock Cord Mount: SCM-3 Eyebolt Fin Thickness: 1/8″ Ring Thickness: 1/4″ Instructions: YesDecal: Logo only (Full decal set available for order here)