1 Box 42Pcs Rubber Ring Lanyard Set: Comes with 6pcs anti-lost necklace lanyard with 36pcs matching rubber rings, black, quantity and color enough to meet your daily need, all of them packed in a paper cardboard box(22.8x12x1.7cm). 16&18&20mm Inner Diameter: Rubber lanyard straps: 768mm long; O Rings 1: 29x24.5x7mm, 20.5mm inner diameter; O Rings 2: 27.5x22x8mm, 18mm inner diameter; O Rings 3: 23.5x20x5.5mm, inner diameter: 16mm, O rings comes in 12 pieces of each size. The lanyard with matching silicone ring can help you find or keep your small items quickly and easily. Easy To Use: The loss-proof silicone rings can be used along with lanyards, also can be used separately as a decoration, You can carry it as you like, hang it on the key ring, suitable for any occasion, and protect your equipment in different ways. High Quality Material: The rubber rings are made of eco-friendly silicone material, lightweight and good elasticity, which can firmly fix the pen on the ring. Lanyards are made of polyester, not easy to fade and can be used for a long time Wide Applications: Smart silicone can use for pendant on phone, key ring, pens, lanyards, USB flash disk and some similar devices.