Princeton Tec - 1" Apex Head & Crown Strap - Black - HL-APX-BK. This Genuine Princeton Tec cloth-elastic headlamp strap is the perfect replacement for your Apex, Apex Pro, Apex Rechargeable and Apex Extreme Headlamps, as well as the discontinued Yukon and Corona headlamp models.. Features:. Water Resistant: IPX4. Color: Black