These are dri riders. They are expandable but are probably 8 years old. I only used on trips so they look good still The negatives are that i rubbed a hole in one on the wheel of my old Buell (so you need to use garbage bags) and it only has one strap, so you need to use rope to tie them on. They are free but so...... Pickup in crows nest. No postage at the moment.