Ecoolbuy Pack of 12 20mm Small Mini Compasses Convenient Outdoor Product for Climbing Go Hiking This listing is for 1 dozen (12pcs) new mini button compasses. These well-made mini compasses are perfect for use in compact, mini, or pocket survival kits. Or put them onto your walking stick, knife, binoculars, backpack, etc. OD size: 20mm (approximately size of a penny) Easy to read compass dial sealed with clear acrylic top and black plastic base Grooved edge for easy carrying with a lanyard.