Cheap And Discounts 99.5%-Al2O3 High Thermal Corundum Tube OD1.3*ID0.7mm/Round Single-Bore Alumina Tube/Insulating Ceramics For Thermocouple Sensors Wholesale. Buy Directly From Merchant New Energy Materials Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.