... there are much differences:1, tpu won't fade out2, tpu has wider hardness range shore A 60 ... As the blower works ,the water ball is inflating. When it is inflated, please draw out the pipe swiftly ... ball does not circulate. The oxygen is limited. When people do exercises, they consume oxygen more than 10 ... regularly2. Must check all the ball before using . When finding the damage ,you must mend it in time ...