Part Number: DX-004-KIT-ANNUAL-MAINTENANCE BlackTip Annual Maintenance Kit x2 - 356 Oring x2- 359 Oring This kit does not include the spare Oring for Exploration Tube Coupling ( x2 - 257 Oring) Spare individual component for Dive Xtras BlackTip DPVs and Piranha X-Props. No instructions provided for installation or use.