; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (249) Ski bindings, valued not more than $55 each Heading 9902.17.55 is amended— (A) by amending the article description to read as follows: Ski bindings (other than for cross-country skis), valued not over $55 each (provided for in subheading 9506.12.80) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (c) Modification to duty rates (1) Artichokes, in vinegar Heading 9902.01.04 is amended— (A) by striking 7.2% and inserting Free ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (2) Artichokes, other than in vinegar Heading 9902.01.10 is amended— (A) by striking 12.7% and inserting 12% ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (3) Nicotine gum Heading 9902.01.13 is amended— (A) by striking 5.8% and inserting 5.7% ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (4) Isohexadecane Heading 9902.01.19 is amended— (A) by striking Free and inserting 1% ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (5) Sodium Heading 9902.01.20 is amended— (A) by striking 2.5% and inserting Free ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (6) Sodium containing not more than 200 ppm of calcium Heading 9902.01.21 is amended— (A) by striking 0.7% and inserting 3.6% ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (7) Hydrazine 64% Heading 9902.01.38 is amended— (A) by striking Free and inserting 0.1% ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (8) Germanium dioxide (GeO2) Heading 9902.01.39 is amended— (A) by striking Free and inserting 1% ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (9) Sodium tungstate dihydrate Heading 9902.01.67 is amended— (A) by striking Free and inserting 2.1% ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (10) p- D ichlorobenzene Heading 9902.01.87 is amended— (A) by striking 2.7% and inserting 4.4%