Which spring is on your rebounder?

If you haven't done a conversion, the serial numbers shown
in the left column will help you decide.

Spring Type	Specs	Serial Numbers
Soft-bounce™ (85% absorption)	4 1/4" end to end barrel shape	4A7000 to 4A8999 1F0609 to 1F9999 1X0000 to 1X9999 3X0000 to 3X9999 5X0000 to 5X9999 7X0000 to 7X9999 9X0000 to 9X9999 1T0000 to 1T9999 3T0000 to 3T9999 5T0000 to 5T9999 7T0000 to 7T9999 9T0000 to 9T9999 L00000 to L99999
Hard-bounce™ (40% absorption)	4 1/4" end to end barrel shape Replaced the classic spring March, 2007	1C1651 to 1C9999
Classic (20-30% absorption)	Production ended March, 2007 3 1/4" end to end coils 3/4" diameter	4A0000 to 4A4999 4A9000 to 4A9999 1C0000 to 1C1650 5N0000 to 5N9999

Soft-bounce IS NOT Classic. The classic spring is not compatible
with either the Soft-bounce™ or Hard-bounce™ spring.

The Classic spring is the old style spring used for very stiff
rebounders. It has a very short longevity. Needak® replaced it
with the long lifespan Hard-bounce™.