DETAILS: Specially mixed and color-tuned silicone to provide a simulated touch and reliable quality. High-quality durable materials and UV-oil spraying post-process for long-term use. All keycaps are suitable for Cross axis mechanical keyboard。 MATERIALS: - PBT How do we pack it： we place it in a sturdy box and wrap the box with tape again. to make sure it will arrive to you safe and sound. If you have any questions regarding compatibility or about the keycaps themselves please contact us!