Genuine leather with fashionable craftsmanship. Anti-slip, durable, comfortable, breathable and no peculiar smell. Strong connectors at both ends securely lock the dial of the watch face. Stainless steel polished silver clasp, anti-slip and sweat-absorbent. Fit for 5.3"-7.5"(135-190mm) wrist. 42/44/45mm Compatible with (Ultra), Series 9/8, Series 7, Series 6, Series 5, Series 4, Series 3, Series 2, Series 1, SE, ALL VERSIONS Thanks for taking a look!