White C4 medium office envelopes from 5 Star are short pocket style envelopes with windows These are C4 envelopes with dimensions of 324x229mm The envelopes has a window of dimensions 40x100mm which is placed 25mm from the left and 213mm from the bottom for clear display of the name and address It has the Press Seal feature which makes it very easy to use and secures the documents held within Each box contains 250 envelopes The thickness of each envelope is 90 gsm to ensure safety of contents