The collection
iPhone 18/iPhone 17 Rectangle Cases
About COCOMII iPhone 18/iPhone 17 Cases
Sized for iPhone 18 Pro Max/17 Pro Max and iPhone 18 Pro/17 Pro, these COCOMII iPhone 18 and iPhone 17 cases keep our signature flat-edge rectangle silhouette with defined corners. Pick the finish that feels like you: real mother of pearl, abalone shell effect, opal effect, tortoiseshell pattern, leopard print, zebra print, croc-embossed faux leather or a checkered design. Each has a built-in MagSafe magnet ring and is 10-foot drop tested.
Fit and Dimensions
By the official specifications, the iPhone 18 Pro Max measures 163.4 by 78.0 by 8.75 mm in height, width and depth (6.43 by 3.07 by 0.34 inches), and the iPhone 18 Pro measures 150.0 by 71.9 by 8.75 mm (5.91 by 2.83 by 0.34 inches). The iPhone 17 Pro Max matches the 18 Pro Max, and the 17 Pro matches the 18 Pro, in height, width and depth, so each pair shares one case. Our iPhone 17 Pro Max to 18 Pro Max fit guide shows how to check any case in under a minute.
Finishes for the iPhone 18 and iPhone 17 Pro Models
The Real Mother of Pearl case is made with genuine mother of pearl, TPU and polycarbonate, in a glossy finish. Choose Natural, Pink or Turquoise on every model, or Black on the iPhone 18 Pro Max/17 Pro Max. Read how to tell real mother of pearl from fake.
The Abalone Shell Effect case has a glossy finish and a polycarbonate and TPU shell. Choose Galaxy, Milky Way, Eclipse or Nebula on every model, or Aurora on the iPhone 18 Pro Max/17 Pro Max. Our abalone phone case guide explains the finish.
The Opal Effect case has a glossy finish and a polycarbonate and TPU shell. Choose Hot Pink or Pink on every model, or Pearlescent or Aurora on the iPhone 18 Pro Max/17 Pro Max. Our opal phone case guide explains the finish.
The Tortoiseshell Pattern case carries a printed tortoiseshell pattern. Tortoiseshell itself is CITES protected. Choose Chestnut, Ivory or Amber on the iPhone 18 Pro Max/17 Pro Max. Read what the pattern on your case actually is.
The Leopard Print case is a glossy leopard print on a polycarbonate and TPU shell. Choose Ivory, Botanical or Camouflage on every model, Chestnut on the iPhone 18 Pro Max/17 Pro Max, or Crimson on the iPhone 18 Pro/17 Pro. See our leopard print case guide.
The Croc-Embossed Faux Leather case has a matte finish and is made with faux leather, TPU and polycarbonate. Choose Ivory or Rosewood Camouflage on every model, or Black on the iPhone 18 Pro Max/17 Pro Max. Read our crocodile iPhone case guide.
The Checkered case is a glossy checkered design on a polycarbonate and TPU shell. Choose Le Carrรฉ de Luxe or Monochrome on the iPhone 18 Pro Max/17 Pro Max. See our checkered iPhone case guide.
The Zebra Print case is a glossy zebra print on a polycarbonate and TPU shell. Choose Bold Chroma on every model. See our zebra print case guide.
MagSafe, Fit & Protection
Every case in this collection has a built-in MagSafe magnet ring and is 10-foot drop tested. The shell is polycarbonate and TPU on every case. The mother of pearl case adds genuine mother of pearl, and the croc case adds faux leather. Each case is cut for one size pair, so choose iPhone 18 Pro Max/17 Pro Max or iPhone 18 Pro/17 Pro on the product page. New to the shape? Our rectangle phone case guide explains the flat edges, the corners and the magnet ring.
Will an iPhone 17 Pro Max case fit the iPhone 18 Pro Max?
Yes. The iPhone 17 Pro Max and iPhone 18 Pro Max share the same height, width and depth, so the same COCOMII case fits both. The 17 Pro and 18 Pro match in the same way, and the same case fits each of those too.
Which iPhone models does this collection cover?
This collection covers the iPhone 18 Pro Max, iPhone 17 Pro Max, iPhone 18 Pro and iPhone 17 Pro. Choose your model in the selector on the product page.
Do these iPhone 18 cases work with MagSafe?
Yes. Every case in this collection has a built-in MagSafe magnet ring, from mother of pearl to croc-embossed faux leather.
Are these iPhone 18 cases drop tested?
Yes. Every case in this collection is 10-foot drop tested and has a polycarbonate and TPU shell.
Is the mother of pearl case real, and what about the other finishes?
Yes, the Real Mother of Pearl case is made with genuine mother of pearl. The abalone shell effect, opal effect and the tortoiseshell, leopard, zebra and checkered designs are effects, patterns and prints (tortoiseshell itself is CITES protected). The croc case is croc-embossed faux leather.
How do I check which iPhone I have?
Open Settings, then General, then About, and read the Model Name. If it says iPhone 18 Pro Max or iPhone 17 Pro Max, choose the Pro Max size. If it says iPhone 18 Pro or iPhone 17 Pro, choose the Pro size.
Choose Your Finish
Browse COCOMII's finish collections across four signature design families.
Complete the Look
Pair your COCOMII case with a Phone Charm Wristlet or MagSafe Ring for a coordinated finish.
