The inside of the silicone cover is equipped with an anti slip feature which significantly reduces the chance the cover will be accidentally removed The base is made from stainless steel to hold items securely in placeNo sharp or hard edges to ensure safetySpecial orders for covers only can be madeWARNING: This product can expose you to 1,3-butadiene, chromium, nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65WARNINGs.ca.gov.