Spring clips sometiemes also called double clips or bulldog clips, this function is like binder clips,make paper documents more clearly,easliy to remove,the spring clip  hole can be hanged .translucent spring clip material is environmental plastic ,no harmful to health.another color is solid plastic 

Features and Specifications：

Description    PCS/TUB           Carton meas(CM)      G/N (KG)    TUB/Carton

22mm             36                        29x29x35                     6.4/5.4              96

31mm              24                       29X29X41                    7/5.5                 96

38mm              24                       35X26.5X48.5              8.8/7                 72

50mm             12                        41X31X41                     8.2/6.2             72

63mm             12                         49X37X48                    12.5/10             60