aviatorruss wrote a review of Sterling Hollow Block - 6.8mm x 13.5in on October 16, 2013
Familiarity: I've put it through the wringer
I agree completely with previous reviewers; these things are GREAT! I use them exclusively for autoblocks during rappels and klemheists when rigging leveraged haul systems (think rescue) and other types of backups. They function well for prusiks too, it's just not a knot I use often (prefer klemheist). Work very well for canyoneering and last a long time. Yes, a piece of 6mm tech/accessory cord with a dbl-fishermans does the same thing...this is just too easy, light and cheap not to own. Plus you get the added heat benefits of using aramid for your backups. just get one and try it.