The Newest model the ISP PERFORMANCE SERIES of kits, which feature factory pre-slotted airframe and through-the-wall fin construction and high power motor capabilities, the DOORKNOB is a great new vehicle to make your Level 1 and Level 2 certification flight with on a small field. Now with LOC-N-FIN technology for easy building, the DOORKNOB is a light weight large diameter kit with presence. We included Tubular Nylon shock cord - 25' of 9/16" tubular nylon and the SCMBA-25 shock cord mount for heavy duty flying. Parachute Recovery.