These are 2-Sided Horizontal Multi-Card Holders. You load your cards from the side. It has a Slot & Chain Holes to attach to most lanyards and beaded metal chains. The front holds one 30 mil ID card and the back holds up to two 30 mil ID badges or six business cards. This Insert Size is 2 1/8" X 3 3/8" (55 X 86mm), the standard size of PVC cards and credit cards. We sell them in Packs of 100 holders. We offer these holders in three color options: Clear, Black, and Blue.