: Spring and frame solid and thicken metal, , anti-rust, stable to use. , strong clamping force, firm, not easy to deform, increase friction, paper from slipping. Easy Installation: Just use a hollow on a stationery board or other board. Strong elasticity and stable structure, perfectly sized to fit nicely with most base boards for a truly unique look. Rubber corner grips hold firmly but won'for t tear your work. , fully customized clipboard with this clipboard clip.