Release tense muscles anytime with premium and portable massage balls! -Gym Tested & Studio Durable- Ready to support the demands of elite athletes and beginners alike. Reliable products that can see you through countless uses. -Anti Slip- The natural texture provided by the cork ensures grip no matter the training circumstance; from a light roll to the most intense hot yoga session the cork will provide unparalleled traction. -100% Natural Product- Solid cork construction, providing a non-toxic, naturally soft, breathable, biodegradable, and HAP free wheel without sacrificing quality.ABSOLUTELY NO INK or printed logos! -Sizing- 2 sizes come in the pair, diameters of 6cm and 8cm.