Description Madeira Burmilon No.200 Bobbin thread-305500-Black 7500mt Burmilon 200 is an extremely fine underthread which means minimum spool changes are required. Please note, for optimum performance, adjustments to the machine may be necessary. Art. N.305 – 7500m – dtex 150 / den 135 – 100% Polyester. Available in Black and White.