S21, S21 Plus, and S21 Ultra. The matte backs look dope! The vanilla S21's the only one in the series with a plastic back. : r/samsung

retail version of Galaxy s21 Ultra : r/samsung

Like New Samsung Galaxy S21 5G SM-G991U1 128GB Pink (US Model) - Factory Unlocked Cell Phone

Galaxy S21 and S21 Ultra review: Enough with the feature overkill, Samsung

S21, S21 Plus, and S21 Ultra. The matte backs look dope! The vanilla S21's the only one in the series with a plastic back. : r/samsung

Best Galaxy S21 Plus Skins, Wraps & Covers – Gadgetshieldz

Samsung Galaxy S21, S21+, & S21 Ultra first look

Samsung Galaxy S21 Vs. S21+ Vs. S21 Ultra: Which Should You Buy?

Samsung Galaxy S21 Review: 6 Reasons You Don't Need To Spend Thousands On The Ultra - Forbes Vetted

Samsung Galaxy S21 Vs. S21+ Vs. S21 Ultra: Which Should You Buy?

Galaxy S21 and S21 Ultra review: Enough with the feature overkill, Samsung

Samsung Galaxy S21 Plus vs Samsung Galaxy S21 Ultra Comparison—What's the Difference?

Samsung Galaxy S21, S21+ and S21 Ultra: The Engadget First Look

Galaxy S21 and S21 Ultra review: Enough with the feature overkill, Samsung

S21 Ultra LED Back Cover? : r/S21Ultra