Material: wrist keychains are made of neoprene, which is handmade and comfortable to touch, abrasion-resistant and sturdy, and durable for you to use in daily life Size: neoprene wristlet lanyard is approx. 16 x 2 cm/ 6.3 x 0.8 inch; the diameter of the metal ring is 2.5 cm/ 0.98 inches which is very suitable for various types of keys **Please message me, if you want more quantity than is listed.