The Maximize ring set is a basic set of cock rings. The intent of the product is to maintain a man's erection longer and easier during either vaginal intercourse, anal intercourse, receiving oral sex or self pleasure. The product came packaged inside of a plastic bag, nothing too fancy but it worked for me and did not expect anything fancy based on the size and content of this product.

The specs/measurements of the cock rings are as follows:
Color: Black
Cock ring style: Stretchy ring
Max stretched diam.: Any size
Unstretched diameter: 1" / 3/4" / 7/8"
Length: 1 1/4"

The material is TPR and based on research I found the following:
Thermoplastics (TPE/TPR)

The Basics: Porous but preferred over jelly/rubber. It is often latex-free, often phthalate-free and hypoallergenic. The material is squishy, smooth and odourless. TPE stands for Thermoplastic Elastomers and TPR stands for Thermoplastic Rubber.

Cleaning Care: These toys are porous so only the surface will be cleaned. The pores will continue to hold onto bacteria, mould and chemicals. Only use soap and water. Toy cleaners will not work. Sanitizing with a dishwasher, boiling water, rubbing alcohol or diluted bleach will break down the material. Using a condom as a barrier has been suggested but there is not actual evidence that this will protect you from bacteria, etc. If you insist on buying a TPR/TPE toy against recommendations then make sure to only use polyurethane condoms as any oils from the TPE/TPR will degrade latex.

Tips: Non-porous TPR/TPE ‘medical grade’ exist, but only trust reputable companies.

Avoid: It is recommended to throw out these toys after 6-12 months of use. Throw out your toy if there are any colour changes, black spots (mould) or odours. Do not share these toys with another person, and do not use for both vaginal and anal insertion.

Storage: Keep away from heat. Ideally keep them in a separate bag from other toys.

Lube: Water-based or silicone-based. Do not use oil.

The cock rings upon initial inspection had no scent and seemed fairly stretchable and durable. Based on the advice from the above, this material should last between six months and a year before adding a potential health risk of bacteria, etc.

I am still enjoying wearing this. Girlfriend and I had sex while wearing them and she said she could feel the rings which added extra stimulation. I stay harder longer after I orgasm which is awesome.