; having an integrated heart rate monitor with optional chest strap (provided for in subheading 9506.91.00) Free No change No change On or before 12/31/2020 . 1663. Certain adjustable dumbbells with rotating end dials Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.89 Adjustable-weight fitness dumbbells, each allowing the user to choose a weight from a range of either 2 kg or more but not over 26 kg or 4 kg or more but not over 46 kg, certified by the importer as incorporating rotating end dials that interlock disks with weight plates supported by a fitted plastic base (provided for in subheading 9506.91.00) Free No change No change On or before 12/31/2020 . 1664. Inflatable tetherballs Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.90 Inflatable tetherballs, each with rope attachment (provided for in subheading 9506.99.60) Free No change No change On or before 12/31/2020 . 1665. Athletic mouth guards Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.91 Athletic mouth guards of plastics (provided for in subheading 9506.99.60) Free No change No change On or before 12/31/2020 . 1666. Boxing and mixed martial arts (MMA) protective equipment Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.92 Boxing and mixed martial arts protective equipment, including shin guards, pads and shields (provided for in subheading 9506.99.60) Free No change No change On or before 12/31/2020 . 1667. Fishing rods, 1-piece, of fiberglass and graphite Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.93 Fishing rods of fiberglass and carbon fiber, one-piece, presented without fishing reels, such rods valued $5 or more but not over $50 each (provided for in subheading 9507.10.00) Free No change No change On or before 12/31/2020 . 1668. Fishing