MacBook Model Size Guide
To identify your MacBook Model number - head to "About This Mac" from the Apple menu in the upper-left corner of your screen
OR
Find the serial number printed on the underside/bottom surface of your Mac, near the regulatory markings, next to "Assembled in China"

MacBook Size Guide:
You may check for the model number under your laptop beside "Assembled in China"
• Air 11: A1370 | A1465
• Air 13 2013-2017: A1369 | A1466
• MacBook 12: A1534
• Air 13 2018-2021: A1932 | A2179 | A2337 (M1)
• Air 13 2022-2026: A2681 (M2) | A3113 (M3) | A3240 (M4) | A3449 (M5)
• Air 15 2023-2026: A2941 (M2) | A3114 (M3) | A3241 (M4) | A3448 (M5)
• Pro 13 (Non-Retina with CD ROM): A1278
• Pro 13 2014-2017: A1425 | A1502
• Pro 13 2017-2018: A1706 | A1708 | A1989 | A2159
• Pro 13 2019-2023: A2251 | A2289 | A2338 (M1) (M2)
• Pro 14 2021-2026: A2442 (M1) | A2779 (M2) | A2918 A2992 (M3) | A3112 A3185 A3401 A3434 (M4) | A3426 A3247 (M5)
• Pro 16 2021-2026: A2485 (M1) | A2780 (M2) | A2991 (M3) | A3403 A3186 (M4) | A3248 A3429 (M5)
• Neo 2026: A3404