This is a pair of Grass Skis from the brand "rollka". I received them as a gift and don't know the details, but I have measured the size and included it in the images. I am also selling a pair of Grass Skis from the manufacturer "AUSUS" in a separate listing. Please take a look if you'd like. I will wrap the main body with large bubble wrap and ship it without a cardboard box. I cannot answer technical questions, so thank you for your understanding.