SLIMTECH FOR LENOVO 500E/500W/300E/300W 3RD GEN (2-IN-1) CASE The perfect solution for in-class protection for your Lenovo 500e/500w/300e/300w 3rd Gen (2-in-1). SlimTech, the latest innovation from Gumdrop, provides solid bump and scratch protection within a slim form factor that’s optimized for charge carts.