Designed and molded exclusively for theAcer Chromebook Spin 312 CP312-1HN/Chromebook 311 CB311-11H/Chromebook Spin 311 CP311-3H/Chromebook 311 CB311-12HTAcer Chromebook Spin 312 CP312-1HN/Chromebook 311 CB311-11H/Chromebook Spin 311 CP311-3H/Chromebook 311 CB311-12HTAcer Chromebook Spin 312 CP312-1HN/Chromebook 311 CB311-11H/Chromebook Spin 311 CP311-3H/Chromebook 311 CB311-12HTIt adopts a full inner lining design, and its size and port holes are consistent with the universal model., eliminating the sway and offset issues found in universal models, providing exclusive protection for your laptop. Heat-dissipating lining protects laptop performance: The lining is made of a breathable, heat-dissipating material that reduces heat buildup during laptop operation. This prevents the laptop from stuttering due to overheating. This combines protection with stable device function, making it ideal for people who work on their laptop for long periods of time. Warning: NOT compatible with other lap