The Billeeit water skipping balls utilize Thermoplastic Rubber (TPR), known for its excellent elasticity and resistance to abrasion, often outperforming standard PVC or low-grade plastics in dynamic play. While TPR is generally solid and can withstand moderate dog chews, its resilience against sharp pool edges or concrete surfaces over thousands of hours of direct impact is comparable to other durable elastomers. Expect minor scuffing on rough surfaces, but the core material integrity should remain high, preserving its water-skipping capabilities due to retained shape and buoyancy.

The 2.5-inch diameter balls are engineered with a specific density and surface texture designed to reduce drag and facilitate lift when thrown at an appropriate angle across water. TPR material typically has a density slightly above water, allowing it to float while providing enough mass for momentum. The smooth, rounded profile minimizes water resistance, enabling multiple skips before settling. Buoyancy is maintained as the TPR material is non-porous, preventing water absorption that could increase weight and reduce floatation over time.

A 2.5-inch diameter is generally considered safe and manageable for children aged 4 and up, offering a sufficient grip surface for smaller hands to grasp and throw. The total set weight of 322 grams, distributed among four items, means each individual ball or disc is lightweight, typically under 100 grams. This weight is well within a child's capacity for moderate throwing distances without excessive fatigue, facilitating ease of play and interaction compared to heavier sports equipment.

The vibrant colors are typically achieved using pigments known for good lightfastness, but prolonged exposure to direct UV radiation (sunlight) and harsh chemicals like chlorine can eventually lead to some degree of fading. TPR itself offers moderate UV resistance. For optimal color retention, rinsing the balls after use and storing them out of direct sunlight is recommended. Expect gradual, minor color shift after hundreds of hours of continuous sun exposure, rather than rapid bleaching.

On water, the TPR's buoyancy and smooth surface allow for the characteristic skipping action. On a grassy lawn, the material's inherent softness and elasticity provide a forgiving grip and reduce impact on joints during catch. The TPR's resilience means it can absorb impacts from being dropped or thrown against moderate surfaces like grass without significant damage, maintaining its shape and playability across different environments. Its non-slip texture also aids grip on both wet and dry surfaces.