it is named Metronic resonator series in the spurt the code industry. it covers the applications of inkjet printing machine.

CompanyType	Frequecny(KHz)	Impedance	Capacitance(Pf)	Diameter(mm)		Support Model	Corresponding diagram No.
				Dmax	Dmin
HNP-5SS-1065	Fs=64.0±2.0	<=1.0	120pF±10%	Ø16	Ø 4.0	Metronic	K
HNP-5SS-1087	Fs=87±2.0	<=0.5	120pF±10%	Ø16	Ø 7.0	Metronic	L
HNP-5SS-10120	Fs=120±2.0	<=0.5	120pF±10%	Ø16	Ø 7.0	Metronic	M

 This type resonator frequency 65k.  it is can also customised as per the customers' drawing and needs. 

ultrasonic resonator