Using high-purity and high-elasticity raw rubber as the main raw material, and thickening the rubber layer on the rubber surface: the thickness of the cover rubber of the 2nd generation Target National is 0.15mm, and the thickness of the cover rubber of the new Target 3 National is 0.35mm. The vulcanization process has been adjusted to make the rubber layer more durable. In the Target series, I think the new Target 3 National rubber is the best to play. It can be simply summarized as "hard, supportive, crisp, and penetrating". Color: Black Rubber: Sticky Sponge: Blue sponge Thickness: 2.15mm Hardness: Medium Soft/Medium Hard