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Help reduce lower back pressure while seated. Use to improve seating posture and alleviate strain on the lower back. Available with Standard or Firm density. Measures 11" (28cm) long with a 4-3/4" (12cm) diameter.幫助減少坐姿時座椅對下背部的壓力。用來改善坐姿，減輕對下背部的壓力。可選擇標準或偏硬。長度為11英寸（28厘米），直徑為4-3/4英寸（12厘米）。NC89000Lumbar Standard Roll Without Straps - Stand..