'fabric: the first layer of cow leather, with good gloss, strong air permeability, soft and tough;<br>Sponge: Sino Japanese joint venture "Toyo Jiajia" shaped rebound sponge, density ≥ 45, compression permanent deformation rate less than 1.3% (international standard less than 10%), not easy to deform;<br>Spring: imported concave spiral spring.
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