Here we have a Brand New AJP / Braktec front/rear 2-pot brake caliper piston & seal repair kit 156.00.225C.
This is the non-magnetic piston version that fits the following bikes with small inboard rear brake calipers and other older bikes fitted with 2-pot front calipers:
Sherco 250/290/300 - 2002 onwards (not 2012/13) only AJP / Braktec
Sherco 125/200 - 2004 onwards (not 2012/13) only AJP / Braktec
Gasgas Pro - All (not 2012) only AJP / Braktec
Scorpa SY250 - All
Montesa 315r - 2001 onwards
Montesa 4RT - All
JotaGas
TRS
Vertigo
EM