8K HDMI 2.1 Version Ultra HD Cable Coiled HDMI Male to Male Extension Cord. OD 4mm Slim Spring Spiral HDMI Cable. extremely stretched to 1.1 meters normal stretched to 80cm. coiled wire design free expansion and contraction more convenient to carry. New 8K HDMI can expand the bandwidth up to 48Gbps HDMI 2.1 version supports refresh rate up to 8K@60H resolution up to 7680 x 4320 33.18 million PX and 120FPS. Can make your large-screen cinema quality and sound quality can be output freely. New HDMI version 2.1 supports 8K ultra-high-definition picture quality transmission and also enhances 4K resolution output.

HDMI 2.1 standard now supports up to 10K@120Hz and supports 4K@120hz. And Compatible with Standard HDMI Version 2.0 / 1.4. supports Dynamic HDR.
NOT: If HDMI 2.1 cable wants to achieve 8K transmission. You need to make sure that your TV graphics card or other equipment matches all HDMI 2.1 features. For example if your device (TV) is HDMI 2.0 version it can only output 4k resolution and 60/30HZ refresh rate.