Special-purpose Tracked Chassis; Kalina is Polish for guelder rose) is a heavy, multi-purpose armoured personnel carrier designed at the OBRUM (OBRUM stands for Ośrodek Badawczo-Rozwojowy Urządzeń Mechanicznych – Polish for Research and Development Centre for Mechanical Appliances) and is produced by the Bumar Łabędy company - part of Polish military consortium - Bumar Group.

The mine magazines are replenished or replaced using a K10 crane mounted at the rear of the vehicle which has a lifting capacity of 2,800 kg.

Supervision of the laying process can be carried out using a rear-mounted video camera connected to a monitoring screen inside the vehicle.

Provision is made for operations under NBC conditions by an air filtration system and a GO-27 or Polish-produced Tafios detection device.

The power pack an air inlet/outlet louvres in the roof and the exhaust outlet on the right hand side.

Two prototypes were made and in 1997 one of them was fitted with a fully developed and tested Italian Oto Melara T60/70A turret.

Universal Tracked Chassis) is a heavy APC that is using technologies from SPG Kalina and PT-91 Twardy.