I bought these for my son's birthday cake as I've never seen them before.
You get two candles in the pack, each about 3 inches long. There's spikes provided that you pull off one end and attach to the other end so you can stick them into the cake safely. There is no wick but a thin tissue paper cover across the top of the candle. This is what you ignite. I used a cooker type lighter (one of those long ones), a match would do also but I personally wouldn't use a lighter!
You just hold the flame to the tissue paper covering across the top of the candle for a second then quickly light the other or have somebody else do it at the same time.
What you get is a mini Roman candle type firework effect! Flaming sparkles will shoot upwards about a foot into the air with loads of crackling noises! It's pretty impressive for their small size. We were impressed anyway. See my pic upload!
The mini firework display went on for approx 30 seconds whilst we all sang Happy Birthday (I even got in some vibrato a-la X-factor style!) and managed three hip hip hoorays just as they finished, good timing!
Give them a minute to cool before removing as like a firework they do get hot!
They're spot on and I'll be getting a few more packs for future use. Highly recommended.