YDT103-204: 1) Size: 4" 2) Magnet: 8oz 3) Voice coil: 1" AL 4) Impedance: 4Ω 5) Max. power: 80W 6) Frequency response: 80 - 20kHz 7) Sensitivity: 89dB YD130-1: 1) Size: 5" 2) Magnet: 60 x 24 x 10mm 3) Voice coil: 1" AL 4) Impedance: 4/8Ω 5) Max. power: 15W 6) Frequency response: 80 - 12kHz 7) Sensitivity: 87dB YD-29: 1) Size: 8" 2) Magnet: 30oz 3) Voice coil: 1" AL 4) Impedance: 4/8Ω 5) Max. power: 150W 6) Frequency response: 50 - 4,000Hz 7) Sensitivity: 90dB YDT1623-405: 1) Size: 6" 2) Magnet: 24oz 3) Voice coil: 1.5" AL 4) Impedance: 4Ω 5) Max. power: 350W 6) Frequency response: 50 - 20kHz 7) Sensitivity: 92dB JT401-1/YD78-10: 1) Size: 4"/3" 2) Magnet: 70 x 24 x 10mm/40 x 24 x 10mm 3) Voice coil: 1" AL 4) Impedance: 4/8Ω 5) Max. power: 40/6W 6) Frequency response: 110 - 12kHz 7) Sensitivity: 89dB YD-40: 1) Applied for greeting cards, toys, musical mugs 2) Many songs are available 3) Any voices can be recorded including customers' appointed voice