These are the replacement O-rings for the Pink Rhino brand laser trainers. Each order comes with one set of O-rings (2 O-rings total).
Each caliber has different O-Rings required. Be sure to select the correct caliber.
The free shipping rate is for USPS first class mail. If you need them quicker, you'll have to pay to upgrade the shipping.
To increase the life of your O-Rings, be sure to lubricate them before each use. You can use any good gun oil.