The collection
Rectangle iPhone 18 Pro Max/17 Pro Max Cases
About COCOMII iPhone 18 Pro Max/17 Pro Max Cases
The iPhone 18 Pro Max and iPhone 17 Pro Max share one COCOMII case size, built on our signature flat-edge rectangle silhouette with defined corners. The finishes run from real mother of pearl and abalone shell effect through tortoiseshell pattern and leopard print to croc-embossed faux leather.
Fit and Dimensions
The iPhone 18 Pro Max measures 163.4 x 78.0 x 8.75 mm (height, width, depth) and weighs 249 g, per the official specifications. The iPhone 17 Pro Max has the same height, width and depth, so the two phones share one COCOMII case. The fit guide for the 17 Pro Max and 18 Pro Max has the details. For the designs sorted by what you want, see COCOMII's best iPhone 18 Pro Max cases. To match a case color to Black, Silver, Glacier or Burgundy, see which case color suits each iPhone color.
Finishes for the iPhone 18 Pro Max/17 Pro Max
Real mother of pearl. The Real Mother of Pearl case is the only finish here made with genuine mother of pearl, along with TPU and polycarbonate. It is glossy, in Natural, Pink, Black and Turquoise. See how to tell real mother of pearl from fake.
Abalone shell effect. The Abalone Shell Effect case recreates the look of abalone in a glossy finish. Colorways are Galaxy, Milky Way, Eclipse, Aurora and Nebula. Read the abalone phone case guide.
Opal effect. The Opal Effect case recreates the look of opal in a glossy finish. Colorways are Pearlescent, Hot Pink, Pink and Aurora.
Tortoiseshell pattern. The Tortoiseshell Pattern case carries a printed tortoiseshell pattern in a glossy finish. Colorways are Chestnut, Ivory and Amber. Read what the tortoiseshell pattern actually is.
Leopard print. The Leopard Print case has a glossy finish in Ivory, Chestnut, Botanical and Camouflage. The leopard print material guide covers what it is made of.
Croc-embossed faux leather. The Croc-Embossed Faux Leather case has a matte finish in Black, Ivory and Rosewood Camouflage. Read the crocodile case guide.
Zebra print. The Zebra Print case has a glossy finish in Bold Chroma.
Checkered. The Checkered case has a glossy finish in Le Carrรฉ de Luxe and Monochrome.
MagSafe, Fit & Protection
Every case in this collection is made for the iPhone 18 Pro Max/17 Pro Max fit, with a built-in MagSafe magnet ring. Each is 10-foot drop tested and built on a TPU and polycarbonate shell that keeps the structured flat-edge profile. New to the shape? The rectangle phone case guide explains what it is and how to choose one.
Do iPhone 18 Pro Max and iPhone 17 Pro Max use the same COCOMII case?
Yes. COCOMII sizes the iPhone 18 Pro Max and iPhone 17 Pro Max as one shared case fit, because the two phones have the same height, width and depth. Every case in this collection is designed for either model.
How do I know if I have an iPhone 18 Pro Max or 17 Pro Max?
Open Settings, tap General, then About, and read the Model Name. If it says iPhone 18 Pro Max or iPhone 17 Pro Max, the cases on this page are made for your phone.
Do these cases work with MagSafe?
Yes. Every case in this collection is compatible with MagSafe and has a built-in magnet ring.
Do these cases protect the iPhone 18 Pro Max?
Yes. Every case is 10-foot drop tested and built on a TPU and polycarbonate shell.
Are the mother of pearl and abalone cases real?
The Real Mother of Pearl case is made with genuine mother of pearl. The abalone case has an abalone shell effect, and every other finish here is an effect, print or pattern. The croc case is croc-embossed faux leather.
Will these cases fit the iPhone 18 Pro or iPhone 17 Pro?
No. The iPhone 18 Pro and iPhone 17 Pro have their own COCOMII collection and their own fit.
Choose Your Finish
Explore iPhone 18 Pro Max/17 Pro Max cases across COCOMII's signature design families.
Complete the Look
Pair your COCOMII case with a Phone Charm Wristlet or MagSafe Ring for a coordinated finish.
