A piston assembly for a multi-disk system, comprising: an adjustor sleeve ; a piston configured to telescope relative to the adjustor sleeve; a puck located proximate a proximal end of the piston; and characterised by a multi-layer insulator located over a surface of the puck opposite the piston, the multi-layer insulator comprising: a first insulator layer contacting the surface of the puck and comprising a first solid disk; and a second insulator layer contacting the first insulator layer and comprising a second solid disk; wherein the first solid disk comprises a first inner circumferential surface , a first outer circumferential surface , a first distal surface extending between the first inner circumferential surface and the first outer circumferential surface, and a first proximal surface oriented away from the first distal surface and extending between the first inner circumferential surface and the first outer circumferential surface; and wherein the second solid disk comprises a second inner circumferential surface, a second outer circumferential surface, a second distal surface extending between the second inner circumferential surface and the second outer circumferential surface, and a second proximal surface oriented away from the second distal surface and extending between the second inner circumferential surface and the second outer circumferential surface; and wherein at least one of the first proximal surface or the second distal surface comprises a plurality of axially extending surface features . an adjustor sleeve ; a piston configured to telescope relative to the adjustor sleeve; a puck located proximate a proximal end of the piston; and characterised by a multi-layer insulator located over a surface of the puck opposite the piston, the multi-layer insulator comprising: a first insulator layer contacting the surface of the puck and comprising a first solid disk; and a second insulator layer contacting the first insulator layer and comprising a second solid disk; wherein the first solid disk comprises a first inner circumferential surface , a first outer circumferential surface , a first distal surface extending between the first inner circumferential surface and the first outer circumferential surface, and a first proximal surface oriented away from the first distal surface and extending between the first inner circumferential surface and the first outer circumferential surface; and a first insulator layer contacting the surface of the puck and comprising a first solid disk; and a second insulator layer contacting the first insulator layer and comprising a second solid disk; wherein the first solid disk comprises a first inner circumferential surface , a first outer circumferential surface , a first distal surface extending between the first inner circumferential surface and the first outer circumferential surface, and a first proximal surface oriented away from the first distal surface and extending between the first inner circumferential surface and the first outer circumferential surface; and wherein the second solid disk comprises a second inner circumferential surface, a second outer circumferential surface, a second distal surface extending between the second inner circumferential surface and the second outer circumferential surface, and a second proximal surface oriented away from the second distal surface and extending between the second inner circumferential surface and the second outer circumferential surface; and wherein at least one of the first proximal surface or the second distal surface comprises a plurality of axially extending surface features . <EOS>