in numerical sequence the following new heading: 9902.24.63 Two-part liquid silicone kits (parts A and B) containing 58 to 70 percent by weight aluminum oxide (CAS No. 1344–28–1) treated with tetrapropyl silicate (CAS No. 682–01–9), 10 to 20 percent by weight ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane (CAS No. 68083–19–2), 5 to 15 percent by weight [dimethyl(trimethylsilyloxy)silyl]oxy-ethenyl-methyl-trimethylsilyloxysilane (CAS No. 67762–94–1), 5 to 15 percent by weight iron oxide (CAS No. 1309–37–1), 1 to 3 percent by weight bis(dimethylsilyloxy)-dimethylsilane (CAS No. 70900–21–9) and 1 to 3 percent by weight silica, [(ethenyldimethylsilyl)oxy]- and [(trimethylsilyl)oxy]-modified (CAS No. 68988–89–6) (provided for in subheading 3824.99.92) Free No change No change On or before 12/31/2025 . 11533. Hydrophobic precipitated silica Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.64 Siloxanes and silicones, di-methyl, reaction products with silica (CAS No. 67762–90–7) (provided for in subheading 3824.99.92) Free No change No change On or before 12/31/2025 . 11534. Silane, trimethoxyoctyl-, hydrolysis products Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.65 Dioxosilane