Alumina Tube 35mm OD/27mm ID x 600mm Long IPSAL99 | IPS Ceramics
Cole-Parmer Ceramic Tube up to 1700 C for tube furnaces, 50 mm Diameter, 1000 mm Length from Cole-Parmer
Amazon.com: uxcell 10mm Dia Ceramic Insulation Tube Single Bore Alumina Porcelain High Temperature Insulator Pipe for Heating Element 10 Pcs : Industrial & Scientific