Challenge with objects

This my pack of objects for this challenge. First of all I must say one of my professors always told us to make things for worst situations so here it is: I have designed These objects for all kind of robots and because they must work instead of humans so it is natural that they must can work in any situation and hold any kind of things. My Models: 1. Cylinder : This objects has two parts;an internal part and an external part.The internal part has teeth and external part is smooth. 2. Empty Sphere:This sphere is a shell that you can fill it with diffrent things such as water,... Now why water? when you fill it with water because of fluently of water it moves and make a shock in walls that it can be a good test for grippers. 3. Cube: It contains one thin plate and 4 teeth and the base cube. 4.Cone,Pyramid and Spring. 5.A pack of some water that when the gripper wants to lift it the form of pack changes and then in lifting the mass water comes in bottom of pack and make a shock. 6. Balloon : Because it is for worst situation and maybe we want to use them in space or in vacuum places so it should have ability of catching the balloon. 7.Paper: I add a paper to test the gripper to not hurt something thin like paper. 8.Finally I put 2 bottles that make worst situation ever: one of them is full of adhesive liquid and one of them full of lubricant liquid that you can use them with combination with other objects to reach in best situation in real world. I hope you like it. Please tell me your advises. Thanks :)