Haifu Sticky and No-Sticky Table Tennis Rubber Pips-in ITTF Approved Internal Energy Fast Attack New Ping Pong Rug for Training Tip: What is the difference between pre base and non base? The base layer of adhesive would not require filling, making it more elastic and height appearing When in use, it can be immediately attached with inorganic adhesive and used straight The unpainted adhesive is a daily edition with out the added homes of Haifu expansion oil Product Parameters: White Shark Rubber Brand: Haifu Rubber Type: Pimples in Surface Feature: No-Sticky(for Backhand) Sponge Thickness: 2 : Red Hardness: About 37° -Play: Fast Attack/Loop Specifications: 1pc Package: Transparent Vacuum packing Feature: Soft,High Elastic,Fast SpeedHitting with metallic sound Blue Whale Rubber Brand: Haifu -Hardness: About 39° Rubber Type: Pimples in -Play: Fast Attack/Loop Surface Feature: Sticky (for Forehand) Specifications: 1pc Package: Transparent Vacuum packing Sponge Thickness: 2 Color: Black Feature base, excessive sticky,strong friction, excessive lethality