Knit Pro Symfonie Natural Wood interchangeable knitting needles are made from densified laminated birch wood. This material is much harder than other woods and ensures that these needles are very strong with sharp points and will not warp over time. If handled correctly, these needles will provide a lifetime of pleasurable use.Interchangeable knitting needles can be combined with plastic cords of different lengths to suit the needs of different knitting projects. This package contains 2 needle points made from laminated birch wood with a metal base. The connection of the needle to the base is smooth and will not catch on knitting.* Cord sold separately.