BR-12 is a vibration-damping butyl rubber sheet
that takes its tapered shape and tuning hole layout after MJ-12, Pyaide's aluminum turntable sheet.
With high-friction butyl rubber it has great grip and great contact to vynl disc to avoid slip
even when its used with high pressure stylus.
From centre to perimeter, it has a taper of 1.0 degree elevated angle.
It will correct a vnyll disc's warpage by the rubber sheet tightly sticking to it.
Then stylus movement will get stable to trace the groove.
The tapered sheet has 18 tuning holes, it contributes more to improve sound quality.
The holes work also as finger rest when removing 10inch or EP discs.
Its diameter has been made 294mm to make it easy to remove LP disc(300mm).
Thickness is 5mm
It also comes with a really rather nice Strobo disc and overhang gauge