There is hook velcro sewn on the back of the shotgun cards. Made for 12gauge shotgun shells only. The "Add Sticky Back Loop Velcro for $1.50" option is a strip of industrial strength loop velcro with industrial strength adhesive. Choose this option if you would like to attach the shotgun card to your shotguns receiver.
Sizing: 4.5" long x 2"wide
Black,CoyoteBrown,RangerGreen,Foliage color is mil spec Elastic.
Muliticam color is printed mil spec Elastic.
ODGreen,WolfGrey color is commerical Elastic.