Amazon.com: TA-VIGOR 2pcs 304 Stainless Steel Tube 6mm OD 1mm Wall Thickness 250mm Length, 0.24 inch OD Thickened Seamless Stainless Steel Round Tubing Metal Pipe for Crafts Industry and Household Processing :
CynKen 4pcs OD 7mm x 6mm ID Stainless Pipe 304 Stainless Steel Capillary Tube Length 250mm: Amazon.com: Industrial & Scientific