4.55 decitex Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.26.79 Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, containing 28 percent or more but not over 33 percent by weight of silica measuring 4.55 decitex in lengths of 60 mm (provided for in subheading 5504.10.00) Free No change No change On or before 12/31/2024 . 4858. Flame retardant rayon fibers, measuring 4.4 decitex Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.26.80 Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, each containing 28 percent or more but not over 33 percent by weight of silica, measuring 4.4 decitex and 60 mm in length (provided for in subheading 5504.10.00) Free No change No change On or before 12/31/2024 . 4859. Other flame retardant rayon fibers Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.26.81 Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning and containing 28 percent or more but not over 33 percent by weight of silica (provided for in subheading 5504.10.00)