Nice packaging. It's a little hard to tell from the pictures so let me explain what exactly is here for the novice like me wondering what each tip is good for. I'm a beginner solderer working with pre-PCBs and basic electronics like noise generators, Arduino/Rasberry Pi etc. I am also trying my hand at some electrical work. T18-D08 - 0.8 x 14.5mm: Ideal for working with small pens under magnification. If you've ever had a problem with a tip that's too big and you can't slide it between the pin and hole without fiddling, this is what you've been looking for. T18-D12 - 1.2 x 14.5mm: This is the tip I wanted the most, it's small enough to make thin pens but big enough to deal with most components used in the Beginner electronics are used. For attaching resistors and microcircuits to circuit boards, this tip is better than the one that came with my hardware. The slightly flat tip provides the best contact, but the tip is so close to the tip that it handles the smallest components with little concern. This tip is too small for larger components like potentiometer legs, but for my purposes I'd rather have a tip that works well with the smallest holes and it will take me extra time to make a few larger ones. T18-D24 - 2.4 x 14.5mm and T18-D32 - 3.2 x 14.5mm: Medium sized spade terminals excellent for general wiring work with medium gauge wire or for attaching large modules to PCBs. They're too big for most of my general electronics work, but there are some components (like burrs and elements that act as heat sinks) that might require a larger piece. They will be good when I need them. T18-S3 - 5.2x18mm: What a massive beast. This is for large high heat capacity parts (radiators) or areas where you can use spot weld solder. Too big for most applications, I think this thing is for fairly thick wire or applications that need a lot of lead to go through, like large glass soldering projects. I might not even need this advice, but having it is better than ending up needing it and not having it. In general: