Colors: more than tens of colors 2 Layers of stones. Compatible with ID badge, Factory worker, Students, ... : Blue, Red, Green, Purple, Black, Gold/Blue, Silver/Red, Rainbow.2 Layers of stones.Compatible with ID card, badge, Factory worker ... IS NOT SPECIFIED WE WILL CHOOSE IT FOR YOU!!! Durable and comfortable strap,fits horizontal Bling lanyard for key chain and ID card holder