Tungsten filaments, new or rebuilt, are formed in high-precision fixtures using a special-alloy tungsten wire to minimise strain. Precise dimensions and microscopic inspection guarantee consistent quality and performance. All filaments are annealed to reduce movement during operation. For most instruments refurbished filaments are cheaper than new ones. There is no doubt about their quality: refurbished filaments' life expectancy and stability are identical to that of new ones.
Minimum order for refurbished filaments is six.