When I switch them from one guitar to another, tying/untying the trebles onto the block or a Diamond bead, I'm impressed with their durability, because to the touch they seem to be made of flexible clay. I've heard them to be less than very good on two guitars that are characteristically bass dominant: a Rainsong NP12A (micarta saddle) that expressed a powerfully lush presence, and a K. Yairi GL600 (bone saddle) that produced overwhelming bass. Leaving out those two unusual guitars, the Rubinos excel with everything I've put them on, from a Cervantes Crossover 1 S/R (corian saddle) to an Ibanez Salvador 7 (micarta saddle) to an Asturias C150S (bone saddle).
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