The Go Green 4K blank white contactless cards are made from 85% recycled plastics and have an operating frequency of 13.56MHz. These eco-friendly access control cards have a remarkable memory capacity of up to 4KB. making them perfect for customers in need of access control cards with extensive data storage capabilities. Sold in packs of 100. Standard CR80 credit card size 4Kbyte memory capacity 13.56MHz operating frequency Made from 85% recycled plastic