sand filled hand weights or free weights

I just came from an appointment with my exercise person. She had some dumbbells that were filled with sand. 

Just wondering if anyone uses those and if so, where can I find them for purchase. What do I call them to find them on internet? Thanks!!

Karen

Actually the dumbbells you have mentioned is a specially made, so you cannot find on internet. Why not ask your trainee by yourself.

I found them at Target but only one size. They are out there, but where? My exercise person said she got them from  a distributor. Going to Target today. Thanks!

Saw some on Amazon. Searched "sand dumbbells."