Laser cut and inlayed with hypoallergenic surgical steel or gold-plated surgical steel, 1.5 inches long. Each come in a metallic blue box decorated with washi tape. 
 
The fun thing about the silver oak is the grain is quite iridescent, making an already stunning piece all the more eye catching. 
 
Note: It is sealed with both cyanoacrylate and enamel, however it is related to poison oak so there is the slight possibility it may not agree with your skin. As someone who breaks out during the sanding process (#worth it) I can wear the jewelry after it's sealed without issue.