Water weights

I bought these 2 dumb bells from Daiso @ Vivocity last Fri. They will add nicely to my collection of Fit Ball, yoga mat, taiji shoes and sabre which are tucked in different parts of my bedroom. Haha. Right now, the weights have not been filled with water. I wonder when I will start to use them to tone my arms. Probably when I have time to sit down and do nothing.