Micro series flat stainless steel sheave, fixed mounting, for ropes up to 4 mm, 19 mm sheave, stainless steel ball bearing, low weight 23 grams. Micro XS cheek block ball bearing 4 mm - 1 sheave, strap Item number: 3532865055 smooth - running ball bearing , bearing body and balls made of stainless steel wobble riveting avoids sharp burrs at the rivet head cheek parts and sheaves 19 x 8.3 mm stainless steel low weight and extremely small and lightweight blocks of compact shape Many versions and fields of application and especially suitable for kicking strap, jigger, trimming lines but also suitable for wire and Dyneema excellent price/performance ratio