SlapKlatz Pro 12pc Damper Gel the right tool for the job.
The perfect way to control unwanted ring from your drums. Experiment with the different size gels for total control.
 
SPECS:
6 x small (2 cm) drum dampeners
4 x medium (3 cm) drum dampeners
2 x large (4 cm) drum dampeners
1 x pro quality waterproof carrying case
12x transparent dividers that can be used as dust protectors