2 Corner Cube reflectors with removable ring, protection cover for optic and certificate, in wooden box.

Radius: 19.05 mm ±0.0025 mm (0.750 in ±0.0001 in)
Centring of optics: ±0.003 mm (±0.00012 in)
Shape ball: ≤0.003 mm (≤0.00012 in)
Acceptance angle: ±30° no limitation due to ring
Material ball: Stainless steel, surface-hardened, magnetic
Weight: 170 g (6.00 oz)