Yikes!! I will now have 32 of the 90kg gliders - this is possibly my last order... They are life savers and back savers. I am able rearrange everywhere on a whim now, change groupings, rotate pots easily for even light exposure ensuring balanced growth, protect plants from the hot summer sun with just a finger...I just love them...I do wax lyrical about them to everyone ...thank you for a great product...