What is it?

Powerful Arm® Cortex®-M7 32b MCU+FPU STM32F730V8T6 Microcontrollers 462DMIPS, 64KB Flash, 256+16+4KB RAM, USB OTG HS/FS, 18 TIMs, 3 ADCs, 21 com IF, including multiple CAN, UArt QSPI, SPI,I2C, SDMMC, SAI, I2s and much more. STM32F730V8T6 Datasheet

Why are you selling these?

I have only used half of the STM32F730 microcontrollers that I ordered for the new version of BlackIce because I could only source half of the desired FPGA chips that they would have been combined with on the planned boards. Therefore I want to make the unused microcontrollers available for members of the maker/OSH community rather than scalpers, hence the listing on Tindie in moderate maker quantities.