We can produce milky quartz tubes size as follows: Out diameter:7mm-160mm Thickness of wall:0.5mm-15mm Technical(physical and chemical) data as follows: 1. Spectral transmission at 500nm 10% Max 2. Sio2 99.5% Min 3. Keep the tube under 900(Celsius degree) for 15 minutes, then put into 20(Celsius degree) water 3 times, no crack. Our company also can supply U type milky quartz tubes, milky quartz rod, transparence quartz tube.