42mm/42mm Series 3/2/1 - Not Series 10 Compatibility: Compatible with Apple Watch 44 mm (series SE/6/5/4), 42 mm (series 3/2/1) of all versions. NOT Compatible with Series 10 42mm (Package include: a Soft TPU Protective Case Compatible with Apple Watch SE/Series 6/5/4/3/2/1 Band). Super easy to install and romove, easy to adjust the size, suitable for wrists 6.3"-8.3" (160 mm-210 mm) Latest Design: The design inspiration comes from a world famous brand, gradual slender; ultra-thin style; exquisite appearance are a popular and fashionable trend all over the world. 2.5 mm thickness and net weight is 0.18 lb, so when you wear it, you will feel lighter and not bulky Craft Material: All made of top-grade solid stainless steel 316L, with high-tech metal wire drawing and smooth surface technology, profession vacuum plating technology, design and aesthetics taking every detail into account. They are beautiful and elegant in color with noble, luxurious, corrosion-resistant, durable, high in hardness, wear-resistant, and comfortable to touch 4.4 4.4 out of 5 stars 12,425 ratings on Amazon