Dry, at a minimum temperature of 15 degrees Celsius. If stored over a longer period of time, release some air. Do not store near a heat source.
Wipe off with a moist cloth. Never rub in with leather fat.
Regularly put a few drops in the valve. This protects the valve and increases the lifetime.
Moisture the nipple (or put some valve oil in the valve). Always use universal pump nipples for hollow needle valves. Inject the nipple straight into the valve.
In case of a problem we will replace the ball (assuming that you have given it the appropriate care of course). DERBYSTAR balls have a very low reclamation rate, the Brillant APS and Brillant TT even virtually zero.
If however, despite all our testing prior to approving the ball, the ball does not meet your standard, please contact us at: firstname.lastname@example.org.