1. Remove the old tire from both wheels and clean any remaining adhesive from the steering wheel. 2. Note: Do not use glue or other hard plastics. You can use all-purpose adhesive, 100% plastic, or neoprene. 3. After applying the plastic, wait 5–8 minutes before attaching the wheel. Allow 24–48 hours to fully cure before use. Positive and negative distinction: The tread on the mop is divided into two parts—one that contacts the ground (referred to as positive) and one that attaches to the wheels (referred to as negative). When replacing the tire skin, ensure correct orientation—do not reverse the sides. - Positive: From the outside, the lines run vertically. - Negative: From the outside, the lines run horizontally. Positive has less resistance; negative has greater resistance. If installed incorrectly, wear resistance decreases and lifespan may be reduced. Material: Plastic Color: Black Package Contents: 4 x Caster Wheels Note: The package includes only the items listed above. Other items are not included. Lighting and monitor settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1–3 cm.