What is appropriate size of icon for 3D Touch shortcut item on home screen?

Question

I couldn't find it on Icon and Image Sizes.

But I mean, what is the size of following icons?

Answer 1

Since Apple will automatically size and re-colour the icons, it's better to use a PDF, which has the added benefit of looking sharper and a reduced risk of causing clipped edges if margins aren't used.

Here's a comparison of PDF vs PNG (exact same icon, originally and SVG exported from Sketch):

The size is also the same.

Answer 2

Below mentioned article, there is a note:

Once you download this, you will see that there is a recommended size:

• 104x104 for 3x
• 70x70 for 2x