I got one of them DMT coarse/medium ones like in Mooses post.Ed Fowler recommends a Wyoming sex rock,and Bare Grills crushes quartz and rubs it on a stick to make a hone,but this only works if you have a urine soaked t shirt on your head and have just ate the ass of a rotten zebra carcass.A small piece of leather with the green stuff on it would not take much space and would be good for stropping.With those diamond stones don't use much pressure 'specially with the coarse and it will last a long time,water helps also,but can be used dry.My 2 coarse ones are smooth in spots where the diamonds were lost due to my ignorance and heavy pressure on a new dry stone.