Crime Scene evidence tents have an 8 cm scale printed on both sides. They are numbered 1 through 20 with black text on yellow plastic. Crime Scene evidence tents are 3.5″ wide and 3″ tall. They are made of flexible plastic and they arrive to you in a light-weight storage box. Each tent has a centered hole for wall mounting. You can also use the center hole to insert an evidence flag or to insert anchors to hold the tent in windy conditions.