Sorry, only available with full Klone kits now, as stocks are running low.
NOS Russian military diodes which have recently been claimed (by the magicians at BYOC) to be the magical mystery 'unicorn tears' in the very popular boost/drive the Klone kit is based on. These are being snapped up by builders from all available sources and won't be around for long.
Get them while you can.
Please note - these are very delicate, and care must be taken when bending the legs. Always hold the leg with needle-nose pliers close to the glass body and bend the leg from the other side. Never bend the leg in such a way as to apply any stress to the glass case. Use a heat sink when soldering.