Lub sijhawm tiv thaiv hluav taws ntawm qhov rooj hluav taws yog 60/90/120min. Cov qhov rooj hluav taws feem ntau yog muab faib ua cov qhov rooj hluav taws, cov qhov rooj hluav taws kub, cov qhov rooj hluav taws tsis muaj steel, cov qhov rooj hluav taws kub thiab cov qhov rooj hluav taws, txawm tias lawv yog ntoo, hlau lossis lwm yam khoom siv. Muaj peb qib A, B, thiab C.

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