These are a direct stainless steel replacement for Newell large size cups. Available in two kits one with bearings and one without.
Both kits come with o-rings that will not harden or otherwise get damaged by grease or salt like cheaper counterparts. The bearings are shielded stainless steel ABEC-5. These bearings come greased but should be cleaned and oiled if casting for distance.
O-rings and bearings can occasionally wear out or break. Replacements can be found here. Please follow the links below.