BT - 100, 25 X 19 cm, 9.8 X 7.4 in
BT - 200, 30 X 22 cm, 11.8 X 8.6 in
BT - 300, 35 X 25 cm, 13.8 X 9.8 in
BT - 400, 40 X 28 cm, 15.7 X 11 in