How to select the ring diameter?

Most of our clients use a ring with a 45-mm diameter. However, other diameters are available. The following is a 4-step procedure to help you determine the right diameter for you.


Lenght in mm lenght in inches Ring size

110 mm à 118 mm

4.33 à 4.67 inches

Ø 36

119 mm à 132 mm

4.68 à 5.2 inches

Ø 40

133 mm à 148 mm

5.21 à 5.82 inches

Ø 45

149 mm à 163 mm

5.83 à 6.41 inches

Ø 50

How to select the tube size

2 sizes available : Small & Standard


Length inside the tube : 48mm (1.9inch)


Length inside the tube : 60mm (2.35inch)

Comparison of small and standard tubes


Specification of the tube

materials used : Biosourced resin - 100% natural
Length of the tube : Standard 60mm (2.35inch); Small 48mm (1.9inch)
inside diameter : Standard 35mm (1.4inch); Small 34mm (1.3inch)
Numbers of air vents : 3
Resistance: Resistant to all solvents and detergent

4 sizes of rings

diameters available

  • Diameter 36mm (1.41inch)
  • Diameter 40mm (1.55inch)
  • Diameter 45mm (1.75inch)
  • Diameter 50mm (1.95inch)

List of shipping expenses by country of destination

Terms of sale

Our products are made with products that comply with CE standards.

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We reserve the right to change prices at any time, but products will be send at the prices listed on the day the order was recorded, subject to availability. For deliveries outside of Switzerland, and unless stated otherwise, the customer is aware that customs duties and formalities may apply: the customer commits to verify the possibility of importing the goods into the country of destination.

Return and Warranty
If you made an error in your order and the merchandise has already been sent, you have three days from the date of receipt to return it. This warranty is valid only for unopened products. You are liable for shipping and return expenses. Packages delivered via TNT can not just be refused. They must be accepted and returned at your expense. In the case of a refusal, no refund can be made. In light of the nature of the product, you cannot return the merchandise as soon as it has been opened. For goods shipped within Switzerland, our prices include VAT. Goods shipped abroad are subject to VAT and customs fees.

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