This is Prologo Mastery Silicone Handlebar Grips - These grips are very high quality silicone. They are 15mm and can expand up to 30 mm. We recommend WD40 liberally applied to the grip and bar. There are some great videos on the internet regarding installing silicone grips.

• Silicone technology applied to the new Prologo grips that allows a perfect fixing to each handlebar ensuring grip and softness.
• Available in black the most widely used color for MTB grips.
• Material: Silicone Foam.
• Length: 130mm.
• UV Resistant.
• Latex Free.
• Weight: 35g approx