Colored O-Rings from www.crazyvapes.com
This O-Ring size is of the standard AS568 series sizes silicone (food grade). http://www.crazyvapes.com
Specs:12.37mm x 2.62mm | 0.4870 x 0.1030 | 31/64″ x 13/128″ | (approximately 11/16″OD x 5/16″ID)
Fits 1″OD x 11/16″ID glass sleeve (pyrex) grommets or caps.
It is made out of food grade silicone.