dimension of the round head please ?

It's approximately 15-16 mm across the widest point (diameter).

Are these compatible with the Samsung galaxy s21+

If the Samsung Galaxy S21+ has a standard 1/8" headphone jack, then yes. I know my Galaxy S10+ does, but that doesn't help you.

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Sony MDR-E9LP/BLU - Headphones - ear-bud - wired - 3.5 mm jack - blue

Product ID: 280003146

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Details

Brand
Sony
Colour
Blue
Ear placement
In Ear
Form factor
In Ear
Impedance
16 Ohm

🔊13.5mm driver for rich sound

🔌1.2m cord with 3.5mm jack for universal compatibility

🧲Neodymium magnet for powerful bass

Description

🎧 Elevate your daily soundtrack with Sony’s bass-packed earbuds!

BASS THAT MOVES YOU - Neodymium magnets ensure punchy, powerful bass to keep your vibe alive.
TANGLE FREE FREEDOM - 1.2m cord length offers the perfect balance between mobility and convenience.
SLEEK STYLISH BLUE - Stand out with a vibrant blue finish that complements your professional style.
UNIVERSAL COMPATIBILITY - Standard 3.5mm jack works seamlessly with all your favorite devices.
IMMERSIVE SOUND EXPERIENCE - 13.5mm drivers deliver deep, clear audio that makes every track pop.

Sony MDR-E9LP/BLU wired earbuds feature 13.5mm drivers and neodymium magnets for rich, powerful bass. With a 1.2m cord and universal 3.5mm jack, they offer reliable compatibility and stylish blue design for on-the-go professionals.