●DIMENSIONS & WEIGHT (each): 5/8 inch (15.88 mm) diameter and 3/16 inch (4.8 mm) thick 0.068 ounces (1.93 grams) ●VALUE PACK: One Dozen (12 pcs) Air-damped Brass with Glass Top Compasses ●GREAT FOR: Survival kits, jewelry making, school science projects, hobbies, or inlaying into walking sticks or rifle stocks ●REALIABLE: Ultra-low friction bearing with a highly magnetized compass needle ●BENEFITS: Air Damped Compasses: No Liquid, No Leaking, No Air Bubbles