Nice Kit

The ELF Makeup Lock & Seal comes with a travel size flat eyeshadow brush and a little cup for mixing.

You are meant to mix some eyeshadow with a drop of the Lock & Seal to get a more bold application, similar to wetting your brush with a bit of setting spray or Fix Plus.

I found this works well, especially with loose metallic eyeshadow shades. The little cup is perfect, it seems small but you don't want to waste product, so it's a good size.