1) wire width 3 /4 / 6mm 2) wire with picture /without picture 3) the best sound / silion rubber 4) with mic /volume control

earphones metal is with below spec. :

Item Number	NLD-EP125-90	Qualification	CE, RoHS & ISO
Speaker dia.	10mm	MOQ	5000Pcs
Sensitivity	110dB+/-3dB	Payment	T/T, L/C, etc.(customer choose)
Impedance	32ohm+/-5%	Packaging Detail	blister, plastic box,PE bag(customer choose)
Frequency	20-22000Hz	Cartoon detail	Size:40 x 27 x 28 cm, Qty:500pcs/cartoon(poly bag package), Weight:0.7kg/cartoon
Cord length	1.3M	Express selection	EMS,TNT,UPS,DHL,FEDEX,etc. (customer choose)
Rated input power/Max input power	5mW/10mW	Sample delivery time	2 weeks
Connector dia.	Φ3.5mm, gold /silver plated or can be 2.5mm	Mass Production time	20 working days

We have many other kinds of metal earphones: 

Quality:

We pursue original and nature musicPure and stereo soundLow distortion ,balance, well-analysis at all ranges of frequencyComfortable wearing & durable

Certificates:

We own below certificates:

CERoHSISO

Services

We are a young, efficient and professional team;We have our own designers, engineers and advanced equipments;We customize acccording to customer needs;We do what we promised.

Transportation:

Our transportion will be according to what you need...

flat wire earphone for moblie phone