NTN Deep Groove Ball Bearings 6018C3, D=90 Series_05^6900 They have a red warning

They have a red warning core that is visible when the sling is worn and should be removed from use

With steel tube handle and ergonomic rubber grip

NTN 6217LLU Deep Groove Ball Bearings

the stopper is locked to reduce the burden on the hand during running

NTN Deep Groove Ball Bearings 6018C3, D=90 Series_05^6900 They have a red warningNTN Deep Groove Ball Bearings 6018C3, D=90 Radial Deep Groove Ball Bearing Round Bore, 90 mm ID, 140 mm OD, 24 mm Width, Open, CN Internal Clearance Bore Type Round Bore Diameter 90. 000 mm, 3. 5433 in Outside Diameter 140. 000 mm, 5. 5118 in Overall Width 24. 000 mm, 0. 9449 in Closure Type Open Row Type & Fill Slot Single Row Non Fill Slot Snap Ring Included Without Snap Ring Internal Clearance CN Operating Temperature Range 40 to 250 F Cage Type