What is known about Sintashta Culture?

[Bosniensis]

On Gedrosia K12 I get:

Population
S_INDIAN -
SUB_SAHARAN -
EARLY_EUROPEAN_FARMERS 33.80 <--- Paleo Balkan
SW_ASIAN 7.64
W_SIBERIAN -
SE_ASIAN 0.57
BALOCHI 4.76
SINTASHTA_STEPPE_HERDERS 32.22 <---- WHAT IS THIS?
INDO_TIBETAN 1.31
CAUCASUS 19.17
E_AFRICAN


Are sintashta people Paleo-Balto-Slavic people, from where they came? Further East?

[Leto]

They are thought to be the original Indo-Iranian horse-breeding culture. The Sintashta is a river in Chelyabinsk oblast, Russia (Southern Urals).