GSM stands for Grams per Square Metre. It is used to describe the thickness or weight of the printed material. If you are unsure of how thick a flyer or poster may be, use an ordinary piece of inkjet/photocopy paper as a guide. A normal sheet of printer paper is usually 80GSM, so a 250GSM standard flyer would be slightly thicker than 3 sheets of printer paper held together. (3x80gsm = 240gsm)

135gsm paper flyers/leaflets are ideal for mass marketing, i.e. when you need to produce very large quantities whilst keeping costs down. These are also the typical weight of leaflet used as inserts in magazines and newspapers or maybe for the odd leaflet that may be posted through your letterbox for a clothing collection for example.

250 & 300gsm card flyers are mainly used by nightclubs & promoters as well as large corporations looking to reflect an image of high quality for their business. Due to their extra weight, they are much more sturdy & durable, perfect for handing out on the streets or including with letters and information packs for businesses.