Rubber
45.5 mm blue ceramic case with anti-magnetic properties and helium escape valve, transparent back, unidirectional...
45.5 mm black ceramic case with anti-magnetic properties and helium escape valve, transparent back, screw-in...
45.5 mm black ceramic case with anti-magnetic properties and helium escape valve, transparent back, screw-in...
45.5 mm black ceramic case with anti-magnetic properties and helium escape valve, transparent back, screw-in...