Characteristics: The O-ring for the keycap is simple to install. Constructed from silicone, it is durable against cracking and tearing. Softer O-rings offer a gentler landing for each keystroke, lessening the impact on fingers. They are designed for improved shock absorption, reducing finger fatigue. Compatible with most mechanical keyboards. Details: Material: Silicone Color options: Black, red, transparent Package includes: 128 O-Rings Note: Minor dimensional variations may occur due to manual measurement.