What was the weight of The sword of Hazrat Ali Zulfiqar?

HAZRAT ALI (R.A) 's sWord (ZULFIQAR) is a heavenly sWord used by HAZRAT ALI and passed on to IMAM HUSSAIN (R.A)

After IMAM HUSSAIN (R.A) was killed in the battle of KARBALA it was returned back to heaven.

So no one really knows except HAZRAT ALI (R.A) His son IMAM HUSSAIN (R.A) or IMAM MAHDI who is not yet to be re-appeared.