Tiasy 12 TB Sata HDD Hard Disk Drive

Active High digital Output (+5V)
3mm Mounting hole for easy mounting
Can be used for multitude of applications

Electrical parts provide students grades 2 and up (age 7+) with hands-on experience designing and building models of working electrical circuits
Snap-together parts require no tools and ensure correct connections
Includes 30 parts, and instructions for over 100 projects, including working models of a photo sensor, a flashing light, and an adjustable-volume siren

Model : S9012, s9013, s9014, s9015, s9018, s8050, s8550, c1815, a1015, 2n5401, 2n5551, 2n3906, 2n3904, a42, a92
15 values x 20 pieces = 300 pieces, transistor assortment kit can cover your general usage.
Type : Pnp / npn