These Dynaplug tubeless tyre repair plugs are designed for use with the Dynaplug Micro Pro Tubeless Bicycle Tyre Repair Tool or the Dynaplug Carbon Ultralite Tubeless Tyre Repair Tool They are made from a viscoelastic rubber impregnated cord and non-abrasive brass tip. 

They come in a (very) pointed version which is great for small holes as it locates the hole best or in a rounded bullet end which is better for the bigger holes