I found some sanus stands that I am going to buy for some Sierra's. I will be using some Blu-Tack to secure the speaker to the stand. Now I am trying to decide on the best option for filling the stands. I will most likely go with either sand or steel shot. Sand is obviously the much cheaper option. Would using sand do a good job at adding extra stability? Or would I be better served spending more for steel shot for even more stability? The main reason I am concerned with stability is because I have nephews that are 1 and 4 years old that visit regularly. Which option would be best? Any advice would be appreciated. Also here is a link to the stands I will be getting.

http://www.walmart.com/ip/Sanus-Stee...Stand/11961196