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Flat-packed for easy transport and storage, quick assembly with dovetail joints, includes 2 plastic frame runners, compatible with National SN1 and SN4 frames, supports use of castellated spacers, fits most standard National wooden hives (460mm x 460mm), made from high-density polystyrene for enhanced strength and longevity, provides superior insulation to keep bees warmer in winter, up to three times stronger than standard packaging foam, lightweight yet robust for easy handling and long-term use.