A set of four vintage Iittala Niva tumblers, designed by Tapio Wirkkala in 1971. 
They have a drip like linear textured exterior with ruffled up middles.

In excellent vintage condition. No noticeable flaws except one glass has an air bubble on the rim which has a short horizontal wavering line leading from it (I suspect moulding issue during manufacture). Barely noticeable but worth mentioning.

One glass weighs 110g. Approx 100ml
And 7cm tall x 5.5cm wide apx.