Very light weight,and works very well if you primarily slide rails and well-waxed ledges.
Doesn't slide well on all ledges.(must be very waxed)
When it comes to versatility, these can't compete with steel pegs. But if you stick with rails and iron or marble ledges,etc...they will last forever. They are incredibly light-weight. It almost makes me laugh to hold it in my hand and compare it to a steel peg. If you are a selective grinder,they are a worthy purchase.