It was made by paper body entwisted by paper rope. It was very dangerous with a lot of injures.
Activation by
TZ 2 or by electrical fuse V10 el.

Length w/fuze : 122mm
Length w/o fuze : 98mm
Diameter : 50mm

Info thanks to Milan.

The photo below shows my own V10a, issued with a ww2 German ZündschnurAnzünder39 which is incorrect.

The photo below was taken in the collection of the MikroMuzeum Vojenstiví , Krimov/Czech Republic.
I would like to thank Zdenĕk Beneš for letting me photograph the grenades in this nice museum collection.