My students love these in the science area. They are good sized and made well. They have held up for many years and I'm sure for many more to come.

Nice discovery tubes. Kids like watching the action.

These tubes are well constructed and work great in my science center

My child care children really like the fast/slow design. We spend lots of time trying to find out which one of the tubes really goes the fastest. Great learning tool.

I am using these in our Pre-K classroom and the children love to play with these in the science center.

My three year old loves these tubes. He does prefer the two with the balls and can play with them for quite a while. The sand one just doesnt get much of his attention. Perhaps because its the slowest and quietest of the three. Overall a great buy.

Hold up pretty good in my 4/5 classroom on the science counter. Kids do enjoy them.

This is an amazing toy for my 4 year old Autistic Grand Daughter and keeps her attention for long periods of time. Thank You All So Much!

These tubes allow students to repeatedly observe how friction, speed, and flow affect motion in a contained object. The visual and auditory feedback hold the attention of my special needs students very well.