Better control of the tone of each frequency, can make the middle frequency warm and generous, the low frequency is full and flexible, and the high frequency is bright and not dry. Made of high-quality materials, strong, wear- and . Ruby and sapphire dual needles, Ruby for LP records and Sapphire for 78-speed vinyl records. Structure: Polarity: When the needle tip is driven horizontally (left + right), the phase of the output voltage of the left channel (L) and the right channel (R) should be the same. Stylus: Ruby+Sapphire The output voltage: When the frequency F is 1kHz, when the vibration velocity V of the sound groove in the L or R direction is 3.54CM/S or the vibration velocity of the transverse sound groove is 5CM/S, the output voltage should be within +/- 4DB relative to the specified value (250MV) (Ie: within the range of 200~300MV). Acupuncture pressure: When testing the tracking ability and electrical parameters of the , the acupuncture pressure should be measured within the range of 40 +/- 10MN. Note: Small objects, Keep away from children to avoid being eaten by children. Material: plastic+metal colour: black Package Contents: 2 x LP Vinyl Needle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.