... 4)w/SG binding material,plastic spiral coil,plastic coilspiral wire,plastic spiral ring,plastic binding spiral is made of quality plastic filaments to meet the ... , including flurescent colors are for your selection. binding material,plastic spiral coil,plastic coil---Specifications Coil DiameterRecommended Max.Book ThicknessPitchInch ,mmmmmm1/4"(6.4mm)3 ...