if you interest in the niobium sheet please contact me ,our company can long term to supply it ,and i will offer you the best price ,thank you for your inquiry . name : RO4200-1, RO4210-2 thinkness(mm)wideth(mm) length (mm) foil :0.03-0.09 30-120>200 sheet :0.1-0.5 30- 40030-1000 plate:0.5-10 50-80050-2000 standard:ASTM B393-98