Anti-slip Application: These silicone non-slip dots can help you stabilise the ruler so that it won't slide and hold up well, which greatly improves work efficiency. Suitable Thickness: The thinner thickness is non-slip and does not affect the flexibility of the ruler's use. Package Includes: You'll get 4 sheets 2 sizes silicone anti-slip ring. Size 1: about 15mm/0.6" in diameter, 30pcs/sheet, 2 sheets; Size 2: about 29.5mm/1.2" in diameter, 20pcs/sheet, 2 sheets. Quality Materials: This silicone anti-slip ring is made of high quality silicone with strong adhesive on one side, smooth surface, not easy to deform, can be used for a long time. Easy to Use: When you use it, just stick it directly to the position you need, clean the surface before sticking to make the adhesion more lasting. Simple and convenient to use, remove it directly after use, no sticky adhesive left behind.