Have them now on al 3 klassik guitars. No more slipping of high E if you give it to few windings.. Most important, occasionaly, i damaged the top of my guitars if the nylons, slips or cracks, so I happen to get dings, With the Tie Block that does not happen. Also the bridge holes do not tend to wear out anymore... so if you want to keep your guitar top pristine... a must buy