These 5-inch spool holder pegs are compatible with the Skadis pegboard system. They are great for holding spools of baker's twine, Serger spools and Overlock cones. These pegs only work with the Skadis pegboard system with lozenge/oval-shaped holes. They are not compatible with round 1/4" pegboards. These pegs are 3D printed with PLA plastic. Note: The 3D printing process can result in slight irregularities like layer lines or slight surface differences between pegs. These irregularities are 100% normal and do not affect the strength or functionality of the part.