1. Do you buy Passive Components? If yes, are there any problems you're facing? Like quality, price, package and L/T...
    Passive Components including trimmer, Quartz Crystal, radial / dipped type for MLCC and tantalum capacitors. We produce these parts.

2. We're ISO 9001:2008 manufacturer since 1990. Maybe we can help you solve above problems. 
    a. Quality is very good. With ISO, UL & SGS approval.
    b. Prices are competitive on the market, maybe not the lowest, but it costs our valued products.
    c. Good package & Fast delivery time.

3. We also sell our parts to Newark Farnell (Element 14), Avnet Abacus, Compel, YE International...

4. Different from other suppliers, our service is very good, enjoy good reputation on the market.
    We show our products in Munich Electronica, Moscow Expo Electronica, Brazil FIEE, HK Asia Electronica.

5. Below is our Passive components we produce, kindly please check if you have inquiry for us.
MKT: Radial multilayer ceramic capacitor.
http://www.kingtronics.com/mlcc-capacitors/radial-mlcc-capacitors.html

LKT:  Chip multilayer ceramic capacitor
http://www.kingtronics.com/mlcc-capacitors/smd-mlcc-capacitors.html

HKT:  High voltage multilayer ceramic capacitor
http://www.kingtronics.com/mlcc-capacitors/high-voltage-mlcc-capacitors.html

TKT:   Dipped tantalum capacitor.
http://www.kingtronics.com/tantalum-capacitors/dipped-tantalum.html

CKT:  Chip tantalum capacitor
http://www.kingtronics.com/tantalum-capacitors/chip-tantalum-capacitors.html

RKT:  Trimmer potentiometer 3296 3006 3386 3266 3362 3329 3590S SMD C3305...
http://www.kingtronics.com/trimming-potentiometers/

QKT:  Quartz Crystal HC49S, HC49U, HC49SMD.
http://www.kingtronics.com/quartz-crystals/