Specification:Bearing for marathon SDE-H37L1 SDE-H35SP1Bearing Size:#1480 Diameter * inside diameter * Height 14*8*4mm 1pcs#1260 Diameter * within diameter * Height 12*6*4mm 1pcs#1030 Diameter * inside diameter * Height 10*3*4mm 2pcsBearing Material: Chrome SteelBearing Speed: 60,000 RPMBearing Grades: ABEC-9Feature: four Size meet the purposes of individuals and dentists.Package include: 4pcs/set