No assembly required. Outer size 284 384mm/11.18 15.12"; inner size 250 350mm/9.84 13.78". Outer size 384 484mm/15.12 19.06"; inner size 350 450mm/13.78 17.72". Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.
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