This is a professional anti-sliding Vinyl Turntable Record Player Disc Stroboscope Disc, made of which is durable for long time use. It is practical for vinyl recorder, which can help to detection the of the needle. Features -Color:White -Material:Plastic -Size:8.00X8.00X0.77cm/3.14X3.14X0.30in -Our product is specifically engineered to detect the speed of and automatically adjust the position of the and stylus, ensuring that you can enjoy sound quality. -The calibration strobe disc of this record player serves a dual purpose, with one side measuring speed and the other side calibrating the head angle. - record enthusiasts will this calibration strobe disc to be an essential tool for making necessary adjustments. Its practicality and versatility make it a convenient option for debugging the machine. -Put the record on the plate, turn on the light, and then adjust the speed control of the turntable until the pattern on the disc does not move. -Made of reliable and practical plastic material, this stroboscope disc is durable precise to use. Package list: 4 x stroboscope disc