1. Remove the old tire from both wheels and clean any remaining adhesive on the wheel surface. 2. Note: Do not use glue or other hard plastics. Suitable adhesives include neoprene, polyurethane, or rubber-based adhesives. 3. After applying adhesive, wait 5–8 minutes before attaching the wheel cover. Allow 24–48 hours for full curing before use. Positive and negative distinction: The tread pattern is divided into two orientations—one designed for the ground side (referred to as positive) and one for the wheel side (referred to as negative). When installing the tire cover, ensure correct orientation—do not reverse the sides. Positive side: When viewed from the outside, the lines are vertical. Negative side: When viewed from the outside, the lines are horizontal. The positive side has lower resistance, while the negative side has higher resistance. Installing incorrectly may reduce durability and shorten service life. Material: Plastic Color: Black Package Contents: 2 x Caster Wheels Note: The package includes only the items listed above. Other accessories are not included. Lighting and monitor settings may cause slight variations in color between the image and the actual item. Measurement tolerance: ±1–3 cm.