They actually do make a little plunking sound when they hit the inside of the PVC. Kratom seed pods do have a noticable weight to them. Especially fresh. And depending on the stage. When they are in the green spikey stage they feel weird. Kinda plastic like but not really. Little less when they are in the green ball stage.
When the pedals have popped the petals are kinda soft to the touch.
And the bees absolutely go crazy for them. It's really exciting to see the ecosystem in action.