The good point for these product;
These model is designed  specially for remote-controls and wireless security  transmitters.
1, Competitive price.  
2, Short lead time
3, 292MHz ,295MHz, 299MHz, 300MHz,303.825MHz,316.8MHz, 318MHz, 330MHz, 370MHz, 390MHz, 423.22MHz, 430.5MHz, 433.92MHz, 868.35MHz, 915MHz, 1000MHz, instocks
4, support custom design.
5, 433.92MHz,315MHz are popular with good price and lead time
6, 100 million pieces annually from a 22-year maker

2.0*1.6mm, 3.2*2.5mm, 3.0*3.0mm(DCC6C) ,3.8*3.8mm, 5.0*3.5mm(SMD5035 Qcc4a) , 5.0*5.0mm(SMD5050 Qcc8c)   saw resonator