4] PLUMB WORKS® 664-0736 Mull-Purpose Nylon Toilet Shims » Ribbed for stacking = ideal for leveling toilet bowls Includes: 10 Plastic Shims Fix anything tho wobbles with durable, interlocking ribbed shims! Directions for use: 1. Insert shims one at a time under low side of object 2. Add shims as necessary unl object is revel and firmly in page. < 3. Shims can be stacked o or cut as needed.