Silicone rubber rings can be used for mobile phones, key rings, pens, lanyards, USB flash drives, and some pen-like items.SpecificationColor: WhiteMaterial: SiliconeSize: Diameter is 40mm/1.6", size of the hole is 27mm/1". Silicone lanyard case for pens (outer diameter 40mm-51mm/1.57-2in).Packing List: 18 x Anti-Lost Silicone Ring HoldersAdvantageThe anti-lost silicone ring of the pen is made of good-quality soft silicone, which is lightweight and stable.InstructionThe silicone pendant holder has a small hole that allows the use of various lanyards to prevent items from being lost and stained and is suitable for any place.NOTEPlease confirm the size before purchasing.