The 68845NV basic set includes 12 carbons, 18 hydrogens and 6 oxygens which is sufficient to build an instructive range of ether models.
Every Orbit molecular model set sold by Indigo Instruments is fully compatible with others you might own. You can replenish any set or customize it with Genuine Cochranes of Oxford Orbit Atoms.
I've had consistently great service from this company. Our students seem to really appreciate the reasonable price. In the years that we've used this product, not one has been returned due to defects.
Considering how many of these we sell to schools every year, that is high praise indeed. Thanks letting us know.
The easiest way to view & then build ethers with this model set is to use our 3D Molecular Model Builder in Orbit (basic) style. Just enter the compound name, hit the Build & Show Purchase options button & an image of the molecule & parts needed will appear. If you need to build bigger molecules, follow the same steps,choose Orbit (flexible) use with Ethers: Advanced Ochem set.