Nine N-channel and one P-channel transistors with very low on-resistance per silicon area. This package has 50 transistors and 10 IRF series, just a combination to meet your needs. Each transistor model is clearly labeled for easy identification. Dynamic dv / dt rating, rugged Professionals and amateurs know that power MOSFETs offer extreme efficiency and reliability. Colour:Black Material:metal Package Contents: 5 * IRFZ44 transistors 5 * IRF540 transistors 5 * IRF9540 transistors 5 * IRF740 transistors 5 * IRF640 transistors 5 * IRF530 transistors 5 * IRF520 transistors 5 * IRF510 transistors 5 * IRF840 transistors 5 * IRF3205 transistors Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.