What is an A-number?
Every MacBook has a model number formatted like A2442 printed on the bottom casing.
MacBooks with the same body design (chassis) are fully physically compatible with the same cases, skins, and chassis-specific accessories, even across different years and Apple Silicon chips.
14-inch MacBook Pro (2021 – Present)
All 14-inch MacBook Pro models from 2021 onward share the exact same chassis design.
Supported A-models:
- A2442 – 2021 (M1 Pro / M1 Max)
- A2779 – 2023 (M2 Pro / M2 Max)
- A2918 – 2023 (M3 Base)
- A2992 – 2023 (M3 Pro / M3 Max)
- A3112 – 2024 (M4 Base)
- A3401 – 2024 (M4 Pro)
- A3185 – 2024 (M4 Max)
- A3434 – 2025 (M5 Base)
16-inch MacBook Pro (2021 – Present)
All modern 16-inch Apple Silicon MacBook Pro models share the exact same chassis.
Supported A-models:
- A2485 – 2021 (M1 Pro / M1 Max)
- A2780 – 2023 (M2 Pro / M2 Max)
- A2991 – 2023 (M3 Pro / M3 Max)
- A3403 – 2024 (M4 Pro)
- A3186 – 2024 (M4 Max)
(Note: 2025/2026 M5 Pro/Max models also share this chassis)
15-inch MacBook Air (2023 – Present)
All 15-inch MacBook Air models share the same body design.
Supported A-models:
- A2941 – 2023 (M2)
- A3114 – 2024 (M3)
(Note: Newer M4/M5 15-inch models also share this chassis)
13-inch MacBook Air (Modern Flat Design – 2022+)
This refers to the newer, flat-style design (no wedge shape) with the display notch.
Supported A-models:
- A2681 – 2022 (M2)
- A3113 – 2024 (M3)
(Note: Newer M4/M5 13-inch models also share this chassis)
Not Supported (Different Body Designs)
These models might look similar at a glance, but they use completely different chassis designs and are not currently compatible with CINNA Products.
Older 16-inch MacBook Pro (Intel)
Older 13-inch MacBook Air (Wedge Shape / Early Retina)
- A1466 – 2012–2017
- A1932 – 2018–2019
- A2179 – 2020 (Intel)
- A2337 – 2020 (M1, old wedge design)
How do I check my model?
- Turn your MacBook over.
- Look for the small text starting with "Model Axxxx" near the regulatory markings.
- Match it with the lists above.