Focusopen IronFrame 4U Outdoor & Multi-Court Racket

The Focusopen IronFrame 4U Outdoor & Multi-Court Racket is purpose-built to withstand the elevated physical demands of outdoor recreational play, beach badminton, and multi-surface recreational environments where standard carbon frames are exposed to UV degradation, humidity cycling, and ground-contact impact frequencies that compromise frame integrity over repeated seasonal use. The frame is manufactured from marine-grade T800 carbon fiber with an epoxy resin matrix formulated with UV stabiliser additives and moisture-barrier nano-coating that prevents resin matrix hydrolysis under sustained outdoor exposure conditions. The outer frame surface is finished with a ceramic-hard polyurethane topcoat at 45 Shore D hardness, resisting the cosmetic and structural surface damage from grass, court surface, and equipment contact typical of outdoor recreational use. The shaft is stiffened to a medium-stiff specification to compensate for the lower string tensions appropriate for shuttlecock types used in outdoor wind-affected conditions. Total weight of 86 grams in the 4U category. Strung at 20 pounds with Focusopen WeatherLine 0.72mm UV-resistant string. Includes a weather-resistant nylon carry sleeve. Focusopen applies a micro-textured anti-glare surface coating to all frame sections, reducing court-lighting reflection that can distract opponents during competitive service routines. String tension maintenance is supported by a high-modulus grommet system using 4.0mm diameter polyamide grommets that distribute clamp loads evenly across the full string hole perimeter to prevent premature string breakage.