This is a no-compromise motion kit - the absolute best you can buy, bar-none there is no other motion kit available for a Voron that beats the Berserker.
This motion kit includes:
Gates EPDM Belts (3M 6mm)
Genuine Gates GT2 20T (6mm wide) Pulley (5mm bore) --- 2pcs
T8 Flange Nut 8mm Lead --- 1pc
Berserker ABEC9 F623-RS Bearing --- 24pcs