Re-Arm Kit L 24gThe Auto/Manual 24G Inflatable Re-Arm Kit contains everything necessary to re-arm the Mustang Survival MIT 100 Convertible A/M inflatable PFDs after deployment. The automatic inflator bobbin on all automatic PFDs should be replaced on a regular basis. Use only Mustang Survival re-arm kits. Use of other re-arm kits may result in improper operation or failure to operate and will void the product&';s warranty. Re-Arm Kit Contains: One 24-gram CO2 cylinder (threaded) One bobbin (used for automatic mode in A/M models only) One re-arming instruction manual *For model numbers: MD2030, MD2030CM, MD2040, MD2040CM