All 5 dice for the price of 4 (in WSF)!
These are Rounded D6 Dices
of 20 mm (they are bigger than regular dice that are generally 16 or 18 mm).
They are hollowed (2mm shell) but still contain the "support material", keeping them relatively heavy.
Opposite faces sum to 7 (well, except for the blank die). You got a blank die, two numerical dice (standard and roman numbers) and two dice with pips (regular arrangement or arranged in circles).
A video tutorial
explains how to do them with 3DS Max. You can also check this post
To buy only one version, check the Custom Round D6